Introduction

The Evistr Digital Voice Recorder L157 is a compact and user-friendly device designed for high-quality audio recording. With 16GB of internal memory, it captures crystal-clear sound in various formats, including WAV and MP3, making it ideal for lectures, meetings, and interviews. The recorder features voice activation, allowing it to record only when sound is detected, which helps save storage space. Priced at approximately $39.99, the L157 is an excellent choice for anyone needing reliable audio documentation.

Evistr Digital Voice Recorder L157 Specifications 

• High-quality audio recording up to 1536 kbps
• Supports MP3, WAV, and other audio formats
• Built-in 8GB memory, expandable up to 128GB via microSD card
• Long-lasting battery life with up to 20 hours of continuous recording
• Compact and lightweight design for easy portability
• User-friendly interface with one-touch recording and playback
• Voice-activated recording (VOR) feature for hands-free use
• USB-C connectivity for easy data transfer and charging

Package Information 

The original package comes with film wrapped, and have bar code information 

Package List

• 1 x L157 Machine
• 1 x Earphone
• 1 x USB Cable (for data transfer and charging)
• 1 x VIP Card

We highly recommend you register at our site to receive an extended warranty (18months), to verify the product authentication, and to have better customer service. Registration is free. 

Operation Guide Explain

Learn how to operate the buttons in the product sketch. 

• Built-in Mic: Captures the voice and records. Do not click on buttons when device is recording. 
• Earphone: You may plug in earphones to hear the playback. USB: For charging or to download recordings to a computer. 
• POWER Button: Switch on/off device power (we recommend you keep power button at ON position unless storing the device). 
• PLAY/PAUSE: Play recordings or turn on/off the device (while power button is at the ON position). 
• REC: Button for recording. STOP: Save recording, stop playback。 
• M: Menu options. Use up/down to select, use M to confirm. Press Stop to return to main menu 
• Speaker: Device has a built-in speaker. You can hear the playback without earphones. 
• UP/DOWN: Selects Menu Options. 
• VOL+ / VOL- : Adjusts the speaker volume. When setting date and time, use this button.

Operational Explanations

These instructions will say “hit” or “press down.” Hit: a short press of the button. Press and hold: press the button a few seconds until the screen shows the information. 

Quick Start Guide 

• Turn ON device: Power button to ON position; press PLAY button for two seconds to turn on the device. 
• Recording: press REC button to begin recording. 
• Save Recording: press STOP button to save recording 
• Delete Recording: press Menu button. Select -> Delete File -> select Delete. This deletes a single recording. To delete all files, go to -> Delete File -> Use Up/Down button to choose Delete All. Use Up/Down button to confirm your choice. 
• Play a Recording: Choose the recording you wish to hear by pressing Menu -> use Up/Down button to choose, press PLAY. 
• Play Next / Previous Recording: press the Up/Down button. 
• Fast Forward / Rewind: press and hold the Up(REW)/Down(FF) button.

Quick Menu Option Guide Using UP/Down Button

To select and confirm, press Menu (M) button. 

• Change Record Format/Quality: go to Menu (M) -> Up/Down button to select Record Setting -> Recording quality -> (1536kpbs WAV format, 128kpbs / 64kpbs MP3 format) 
• Voice Activated Mode (AVR mode): go to Menu (M) -> select Record Setting -> Up/Down button to Voice-activated mode-> M button to select AVR mode -> select ON. 
• Voice Activated Level: go to Menu (M) -> Up/Down button to select Record Setting -> select Voice activated sensitivity -> select from levels 1 to 5. 
• Set Time: go to Menu (M) -> Up/Down button to select System setting -> Up/Down button to select Date and time -> select Set time -> use Up/Down and VOL+ buttons to change time. Press M button to confirm. 
• Set Date: go to Menu (M) -> Up/Down button to select System setting -> Up/Down button to select Date and time -> select Date -> with Up/Down and VOL+ buttons change date, and press M button to confirm.

Important Notice for Using The Device

• Do not shut down the device’s power button when it is saving a recording.
• Do not scratch the recorder body.
• If typing or writing near the device while record function is on, it will capture the noise.
• Do not format the device unless the files have been backed up.
• Do not cut off power while formatting device.
• Do not delete a file unless the file has been backed up.
• Do not press any buttons when device is connected to a computer.
• Do not use non-original micro USB cable to transfer data from device to computer. Not all micro USB cables support data transfer.
• Do not set View Playing unless needed. It only plays 10s seconds of each file.
• Do not use the Voice Activated Function unless needed. It may not record some low decibel voice you want recorded.
• Do not turn on the sleeper time function unless needed, as this will force the device to shut down, even if in use.
• Do not pause the device for a long time, as the device will automatically shut down when there is no operation such as playing or recording.

Description

The Evistr Digital Voice Recorder L157 is engineered with precision to deliver crystal-clear audio. Its high-sensitivity microphone captures even the faintest sounds, ensuring that every detail is recorded accurately. The device features a backlit LCD display that makes it easy to navigate through settings and playback recordings, even in low-light environments.

The recorder comes with multiple recording modes, including continuous, timer, and voice-activated recording, allowing you to customize your recording experience. The built-in speaker allows for immediate playback, and the USB-C port ensures fast data transfer and charging.

Basic Operation Guide

Charging Voice Recorder 

Connect it to computer with enclosed cable, it will charge, once it has finished charging ( typically around 1.5-2 hours), we could eject the device from the USB port We can also connect the voice recorder to other USB socket for charging (like USB wall charger, USB charge dock) Charging Input: 5V 500mAh 

Turn On Voice Recorder 

Simply push the power button (at left side ) to “ON” position, it will boot up ( screen light on, and see EVISTR logo ) Switch it back to “OFF”, it will shut down See below picture

NOTE: we recommend that you push the POWER button up to the ON position to turn on the device. Unless storing the device, we recommend you turn on/ off the device by pressing down the PLAY button.

• ON: push up the power button to ON position

  

• OFF: push it down to OFF position, totally shut down

  

How to Recording

Press & hold PLAY button power on the voice recorder 
(NOTE: keep the left side POWER switch at the ON position, if it is at the OFF position, we need to push it to the ON position first) Press REC, and it starts to record Press STOP, it saves the recordings

1. Press & hold PLAY to turn ON

   

2. Press REC, to record

   

3. Press STOP, save recordings

   

   NOTE: press STOP to save recording every time when complete a recording task.

If, for example, we press REC and STOP 3 times, the recorder will create 3 recorded files corresponding to each time, and they will typically be named

Each recordings will be saved a file names with date in sequence, but it has a time stamp If we want to see the recorded date of file “20180510162305.MP3”, we could click right button and view file properties, we will see the recordings file time File Name Format: Year-Month-Day-Hour-Minute-Seconds See the right side picture shows: 

How to Pause and Resume Your Recording 

• During recording, press PLAY pause recording 
• Press PLAY again, resume recording 

Note: do not pause a recording task in long time, it will automatically turn off the device (power saving function)

How to Playback Recordings 

Press and Hold PLAY boot up the voice recorder Press PLAY, playback the latest recordings. We could press UP/DOWN button to select the recordings which need to playback. 

NOTE: If it reads MUSIC folder, We could press and hold STOP (and wait a moment) to switch between MUSIC and RECORD folder

1. Press & Hold PLAY, open your voice recorder

   

2. Press PLAY to playback the recordings

   

How to Fast Forward / Rewind 

During playback, Press and Hold UP / DOWN to rewind / fast forward 

How to Delete Recordings 

Delete recordings, it could have 5 method 

1. Format the recorder EVISTR L157 disk on your WINDOWS computer directly (all data will be erased completely) 
2. From computer, go to EVISTR L157 disk, find folder “RECORD”, select the recordings you want to delete on computer 
3. Format the recorder on the device directly 
4. Delete single file on the device by enter delete mode 
5. Delete all recordings on the device by enter delete mode

Now we introduce how to delete recordings on the device by enter delete mode. 

In pictures ,we introduced how to Delete single recordings, and how to delete all recordings Press M(menu) button -> Delete File -> Delete, it will delete the currently file Select Yes, press M to confirm your selection, it will delete the recordings as your selection

Note: We could press UP/DOWN to select recordings firstly, and then press M to select delete file 

How to Playback Music 

By pressing PLAY button turn on the voice recorder 

• Press and hold STOP, switch to music folder ( if you are at recordings folder) Press PLAY to playback music 

Notice:

• if it shows “no songs” that mean there is no songs file in the recorder, or the song file format are not supported.
• Press and hold STOP button for 3 seconds, and then release the STOP button, wait a moment, it will switch back to recordings folder

Restore to Factory Settings 

Restores to factory default. Very helpful if confusion arises when creating settings. 

Here is the steps to restore to factory settings 

• Press Play (turn on device) -> hit M -> use Up/Down to System Settings -> hit M 
• Find & select "Factory Settings" 
• Press M(menu), enter it, find & select “Yes” 
• Press M (menu), confirm your selection, and it starts to restore to factory settings.
• When it succeed, screen will show “restored!”

Format Device 

Format on the device directly 

Here is the steps to format the recorder 

• Press Play (turn on device) -> hit M -> use Up/Down to System Settings -> hit M 
• Find & select "Format Device" 
• Press M , enter it, find & select "Yes"
•  Press M , confirm your selection, and it starts to format 
• Screen will show “please wait”, after format completed, the device will restore settings, and reboot. 

Do not shut down the device, until this procedure completed

WARNNING: When format device, do not cut down the device power, unless formatting completed, and the device could operate again Backup all files you need before format the device, once format completed, all data will be erased and cannot restore.

How to Connect to Computer 

Use the enclosed Micro USB cable connect it between your computer and voice recorder, when successfully connected, you will see the connection icon, see as following picture After we successfully connected to a computer, we could delete the files in the recorder, copy file from the recorder out to computer, copy file into voice recorder device, it just like a normal flash drive

Format EVISTR L157 Drive on Computer Directly 

When successfully connected to computer, click the mouse right button, and format it, like below picture shows:.

Notice: all data will be erased completely, so please backup before formatting device 

System Time & Date Setting 

Turn on the voice recorder Press M (menu), find & select " System Setting" Press M(menu), enter System Setting, find & select "Date and time" Screen will display “set time”, “set date” 

Set Time

1. Select Set time, Press M

   

2. Press UP / DOWN to adjust hour, Press VOL+ / VOL- move to next

   

3. Press UP / DOWN to adjust Minutes, After setting Press M(menu) to confirm

   

Set Date

• Select Set Date, Press M

  

• Press UP / DOWN to adjust Year, Press VOL+ / VOL- move to next, month & day

  

• After setting, Press M(menu) to confirm

  

• Press UP / DOWN to adjust Year, Press VOL+ / VOL- move to next, month & day

Now we have successfully set time and date for the recorder

Go to Setting (Menu Options) 

At the status of stop recording and playback, you could press M (menu), enter menu options 

The buttons will performs like this 

UP,DOWN: for selection V
OL+, VOL-: for move to next when in time setting 
M(menu): for confirm selections STOP: return back 

• I have met some issues with my voice recorder, don’t worry, don’t give up just yet and assume that it is defective 
• At Chapter FIVE, we offer some very common troubleshooting, just have a quick look, based on our customer feedback, mostly issues could be solved from trouble shooting guide. 
• If cannot get the issue fixed, don’t be hesitated to contact with the order ID, model number, so we could help to solve the question more effectively. 
• All products with 1-year warranty, and Customer satisfaction was guaranteed.

Advanced Operation Guide

Record Setting 

Recording Quality 
At recording quality setting, it could select recording quality at 1536kpbs (WAV format), 128kpbs (MP3 Format), 64kpbs (MP3 format) 

Record Led ON: default. LED indicator light is ON. OFF: turn off the LED indicator light. 

Subsection Recording 
At subsection recording, it could select Half hour, One half, Two hour, CLOSE

What is subsection recording? 
Recorder will automatically save the recording file at a selected time length and start a new recording. Half Hour: record each file at 30minutes. One Hour: record each file at 1 hour. 
Two Hour: record each file at 2 hour. 
CLOSE: turn off subsection record function. e.g. When select Half hour, each time, recording time length reached 30minutes, it will automatically save the recording, and then start a new recording. If want to close this function, select CLOSE, and press M(menu) to confirm & save settings.

Voice Activated Recording What is Voice Activated Recording? 
When AVR mode is ON. Press REC, screen will display VOX information, it means the device successfully enter voice activated recording mode. 

Voice Activated Mode (AVR) 
When AVR is on, device will record any voice. If no voice is detected, it will not record to reduce blank time and save storage space. At AVR mode, we still need to press STOP to save recordings when we complete a recording task.

AVR Mode ON: turn on voice activated record function. OFF: turn off voice activated record function. Voice Activated Sensitive Level From Level 1 to Level 5: Level 1 only picks up voice or sound above 70db, a very loud sound. Level 5 is very sensitive, so any quiet sound will be recorded. (i.e. normal environmental noise will activate recording). 

Note: do not turn on this function for important lectures or meetings. It may skip or lose some very important sentences at low decibels. Use regular on/record/stop for meetings. It could select from level one to level five Level one, is the mostly dumb level, it means the mic will be less sensitive, need louder voice to active the recording, otherwise, the recording time is not counting, and it was pause recording. While level five, is the mostly sensitive level, it means the mic is very sensitive, just a soft speaking will be captured. It will be almost continuously recording, cannot see pause status.

NOTICE:

• When voice activated recording is ON, during recording screen will show VOX
• During recording, if no voice detected, the time will not counting, that means the recorder was automatically paused recording, when voice detected again, it will resume recording automatically
• Select desired MIC sensitive level according to demanding

Record Monitor ON: when ON, use earphones to hear what it is recording. OFF: turn off this function. 

Exit 
Exit record setting, return to up level menu

System Setting 

Sleeper timer 
When select sleeper time, it will force the device to be automatically switched off. 
The options: OFF, 10minutes, 30minutes, 60minutes, 90minutes, 120minutes

Backlight timer
Backlight timer, it will control how long the screen will light up without any operation. 
The options: 20seconds, 30seconds, Always on

Notice: we do not recommend to select at always on, because this will consume the battery very fast 

Brightness 

• Brightness: adjust the screen from dark to bright The options: from 00 to 15 

Notice: higher number means the screen will be brighter, and need to press M(menu) to confirm the changes, otherwise the setting will not be effective. 

Date and time 

• Set the system time of the recorder (set time, and set date)
• UP/DOWN: to adjust the hour, minute, year, month, day
• VOL+/VOL-: move to next 

Notice: Once set the correctly time, remember press M(menu) to confirm the changes.

Language 

Change the device display language

Information 

• Player Information: it will show the device firmware version, and system firmware released date
• Disk Space: it will show the free space, and total space of the built-in memory

Format Device 

Format device, it will erase all data on the device, and cannot be restored forever

Notice:

• Do not format the device unless you have already backup the data on the device to computer, and you are sure about this.
• Do not cut off its power during format the device, otherwise it will meet disk error
• During format device, wait till showing completed information, and the device reboot, and then you could switch off the device.
• If unfortunately, cut off device power, and see DISK ERROR, Here is the rescue: Please kindly cut off the device POWER from ON to OFF position, and connect to WINDOWS computer, format the disk again from computer, and then things will be normal. And all data will be erased thoroughly. (for MAC computer need to contact customer for tutorials)

Factory settings 

Factory settings
Restores to factory default. Very helpful if confusion arises when creating settings. Enter to Factory Settings, screen will show “ Restore Yes No” When select Yes, and press M(menu) to confirm the choice, so all settings will be restored to default. Screen will show “Restored!”

Play Setting 

• Play Mode Repeat: Repeat off, Repeat One, Repeat All Repeat off: select and confirm this, it will play in normal, from first recording to the last one
• Repeat One: select and confirm this, it will repeat on single track again and again
• Repeat All: select and confirm this, it will repeat from A-Z again and again 
• Shuffle: When shuffle is on, it will playback all recordings or music in random, even you press UP/DOWN, it will not select to next or previous track, it will be random. 

Sound Setting 
Sound Settings could adjust Equalizer (off, Rock, Pop, Soft, Jazz, Classical, Techno), Select and confirm changes, it will becomes to effect.

Failed Connect to computer

Sometimes, you may met the failed connect to computer issue, it is normal like you failed connect your flash drive to computer, so the solutions are same way for solve it. Here are some suggestion for you fix this issue

• A. Before connect voice recorder to computer, switch OFF the voice recorder
• B. When connect the voice recorder to computer, do not press any buttons on the voice recorder, it will exit connection mode
• C. Do not swing the Micro USB cable when connect to computer, in case of unstable connection
• D. Sometimes failed connection due Micro USB cable is broken or USB socket is loose, change a new cable (like your android phone cable) or connect by another USB socket, or simply reboot your computer
• E. Even worse, still failed connection, here is an advanced solution

We could do debug as following:

1. On your computer, go to Computer manage

   

2. Computer Management

   

3. Find Device Manager

   

4. Click right mouse button, enable the recorder device / or scan update hard drive changes to help you find the recorder drive

   

TROUBLESHOOTING

1. No Voice Recordings 
   If there is no voice recordings, or you have deleted all recordings in your device, you will see “ no voice recordings” or “no songs” on the screen. Don’t worry, you could just go ahead to press REC.
2. How to Close Record Light
   Go to record setting -> Record led -> select close(OFF), so when recording, the record light will not light up or flash
3. Format Error 
   Format Error, this usually happens from 3 aspect: 
   A. During recording, directly push down the POWER BUTTON to OFF position, that will cause file damage, we need to press STOP save the recordings firstly 
   B. The recordings time length is less than 5 seconds, like ZERO second recordings file 
   C. Computer do not support the .wav file. The recordings were saved as .wav format. For WINDOWS 10 or MAC user may encounter with this issue. Don’t worry You could download the free MplayerX / VLC Media Player to solve this issue http://mplayerx.org/ http://www.videolan.org/vlc/ 
   D. Try to Record at MP3 format, so it will be more widely supported by different computers
4. Disk Error 
   Due static shock, like over current charging, cut off its power when format device didn’t completed, so it lost system firmware. 
   How to Rescue: Keep its power button at OFF position, connect to windows computer, and format the recorder disk again, things will be normal (for mac computer, contact customer support for tutorials)
5. How to connect to computer 
   Use the attached cable connect to your computer, or your android phone cable If you failed connect it to your computer.
6. Can I delete recordings from computer 
   Yes, when the recorder was successfully connected to your computer, you should find it as an removable drive names as “L157”, and all your recordings was saved in a folder names “RECORD” in the drive. You could delete file or copy file into it, same as your ordinary USB Flash Drive.
7. When Connect to computer, the buttons not work 
   When connected to computer, it will enter connection mode, the device screen will show the “CONNECTION ICON” like the CHAPTER TWO, POINT 13 picture shows. All buttons will not work at this situation, if you press M and hold it, it will exit connection mode, and will be failed to connect to your computer.
8. Cannot find my recordings in the recorder 
   This mainly caused by the device reading the MUSIC folder, you could press and hold STOP switch back to RECORD folder 
   Or connecting computer, and check whether there is recordings in the device or not.
9. How to Turn ON Voice Activated Function 
   Go to Menu Options, find record setting, enter it -> Voice Activated Setting -> AVR mode -> ON, and press M confirm it. 
   Now pressing REC, the screen will show VOX, it means you have successfully set voice activated recording function
10. How to Use the AVR Mode (Voice Activated Function) 
    When AVR mode is ON, the recorder will enter voice activated recording mode. It will only picks up loud enough decibels voice (any sounds). 
    So we could select the best AVR level as we want, and get the best effect of voice activated recording. 
    For L157 voice recorder, the AVR level could be selected from 1 -5; The lower number means need higher decibels voice to activated the recorder, and it need louder voice; At level 5, it is very sensitivity, only a very low decibels or quiet speaking could be picked up. 
    Also, when voice activated function was ON, press REC, it will record 3 seconds, the device run 3 second to check the recorder was corrected entered recording mode. And then it will only pick up loud enough decibels voice / sound.
11. Press REC, it not recording 
    First check, the recording light blink or not 
    Second, can you see VOX on the screen, If so, we suggest you could close the AVR mode, if you do not want this function 
    Third, confirm if there is enough free space on the device.
12. Press REC, it shows “OVER RECORD” 
    When press REC, it not records, it show “OVER RECORD”, that means the voice recorder memory is full, or you have too many “FOLDER” or “recordings” in the recorder. 
    Why this happened? Although you may not record too long time. Sometimes mistakenly RECORD, and SAVE again and again, or copy or create too many “FOLDER” in the recorder disk. Maybe there is some files that cannot be read by the recorder, so you cannot find directly from the recorder So you need to format the voice recorder, or connect to computer and have a check, after that format the recorder disk from your computer directly
13. Why it is only playing 10 seconds 
    This is because you have entered view playing playback mode, it will playback 10seconds of each file 
    At the status of playback, you could press M (menu), find Repeat, enter it 
    Select Repeat All or other mode, press M (menu), confirm your setting
14. Why it playback in random 
    Same way to solve this issues as issue 12, go to play setting, close the shuffle function
15. How to use the A-B repeat function 
    During playback, press and hold M, you will see A on the screen, and B is blink, it selected the start point 
    Press and hold M again, select point B 
    Now it will playback between Point A to B
16. The recording is noise 
    Don’t recording near computer, electric fans, air conditioner, sound bar that will easily cause noise, the recorder will pickup this statics noise
17. The recorder auto shut down when I am recording 
    Why this happened? 
    The sleeper time function is ON, when set this, no matter you are operating the device, or recording or playing, it will force to shut down the device. So you could go to System setting - > sleeper time, select OFF and confirm it. You will close the sleep time function. In default, it was at zero. 
    So you could also try to restore to factory setting when this happened, if not sure how to set the sleeper time.
18. I Cannot Shut Off My Voice Recorder 
    When the recorder is charging, or connected to computer, even when the POWER BUTTON ON/OFF was at OFF position, it will still be ON, and you cannot shut off the voice recorder at this status (because the voice recorder directly get power from charging socket or computer)
19. How to format the recorder 
    Press M (menu), enter menu 
    Select System Setting, press M (menu), enter it 
    Select Format Device, Press M (menu), enter it 
    Enter Format Disk, select Yes 
    Press M (menu), confirm and start to formatting, after formatting completed, all files on the recorder will be deleted, and now you will get your 8GB storage on your voice recorder back.
    Do not shut off the device during format disk
20. Space is full
    When space is full, you can connect to your computer and back up all the files to your computer, and then delete all the recordings in your voice recorder. 
    (Do not cut off recordings from recorder to computer, this cannot delete file from recorder successfully, and still occupy the disk space) The voice recorder has a limited storage at 8GB / 16GB, so after a while of using, it may be full of storage, you need to back up it on your computer.

Pros & Cons

Pros:

• High-quality audio recording
• Long-lasting battery life
• Compact and lightweight design
• User-friendly interface
• Voice-activated recording feature
• Expandable memory via microSD card

Cons:

• Limited built-in memory without expansion
• No built-in FM radio or other multimedia features
• May require additional software for advanced editing capabilities

Customer Reviews

Customers have praised the Evistr Digital Voice Recorder L157 for its excellent sound quality and ease of use. Many have found it indispensable for lectures, meetings, and personal note-taking. However, some users have noted that the built-in memory is limited and that additional software may be needed for advanced editing.

Common complaints include the lack of an FM radio and other multimedia features, but overall, the device is highly recommended for its core function of high-quality audio recording.