Introduction

Designed to provide excellent sound quality when on the road, the Sony Stereo Headset WH-CH400 is a stylish and lightweight wireless headset. Its Bluetooth connectivity makes pairing with your devices easy, so you can enjoy calls, podcasts, and your favorite music without worrying about tangled cords. With just one charge, the headset's long-lasting battery can support up to 20 hours of listening. You can use it for extended periods of time thanks to its comfy on-ear design, which makes it a great option for working, playing, or commuting. To further improve your listening experience, the WH-CH400 has an integrated microphone for hands-free calls and simple access to voice assistants.

What You Can Do with the Bluetooth Function

The headset uses BLUETOOTH wireless technology, allowing you to listen to music or make phone calls wirelessly.

Listening to Music
You can receive audio signals from a smartphone or music player to enjoy music wirelessly.
Talking on the Phone
You can make and receive calls hands-free, leaving your smartphone or mobile phone in your bag or pocket.

Detailed Specifications

The Sony Stereo Headset WH-CH400 boasts several impressive features, including:

Bluetooth version: 4.2
Frequency response: 20Hz-20,000Hz
Driver unit: 30mm
Impedance: 20 Ohm (1 kHz) (when connecting via the headset cable with the unit turned on)
Battery life: Up to 20 hours
Weight: Approx. 154g
Supports A2DP, AVRCP, HFP, and HSP profiles
Integrated microphone with echo cancellation

About Voice Guidance

You will hear voice guidance in the following situations via the headset:

When powering on: “Power on”
When powering off: “Power off”
When entering pairing mode: “BLUETOOTH pairing”
When establishing a Bluetooth connection: “BLUETOOTH connected”
When disconnecting a Bluetooth connection: “BLUETOOTH disconnected”
When the remaining battery charge is low when you turn on the headset: “Battery level low”
When automatically turning off due to low battery: “Please recharge headset”

Checking the Package Contents

After opening the package, check that all items in the list are included. If items are missing, contact your dealer. Numbers in parentheses indicate the quantity.

Wireless Stereo Headset (1)
Micro-USB cable (approx. 50 cm/19 3/4 in.) (1)
Reference Guide (1)
Operating Instructions (1)
Other documents (1 set)*

*May not be supplied in some countries or regions.

Location and Function of Parts

Headband
L mark
(L) Left unit
R mark
(R) Right unit
Slider
Slide to adjust the length of the headband.
Tactile dot
The left unit has a tactile dot.
button
Operate to turn on/off the headset, play music, or make a call.
Indicator (blue/red)
Lights up in red while charging. Lights up in red or blue to indicate the power or communication status of the headset.
Micro-USB port
Connect a computer or USB AC adaptor (not supplied) to this port with the supplied micro-USB cable to charge the headset.
Microphone
Picks up your voice during a call.
Built-in antenna
A Bluetooth antenna is built into the headset.
(volume +/next) button
(volume -/previous) button
N-mark

Description

The Sony Stereo Headset WH-CH400 provides a high-quality wireless audio experience with an adjustable, lightweight design for comfortable everyday use. Easy Bluetooth connectivity makes pairing with your devices a breeze. These headphones offer seamless control over music, calls, and volume through the integrated buttons and microphone. The built-in battery offers up to 20 hours of uninterrupted use, making them perfect for long workdays, commuting, or gaming sessions. With a smooth and durable finish, the WH-CH400 is available in various attractive colors to suit your style.

Disconnecting Bluetooth Connection

(After Use)

For devices that support one-touch connection (NFC): Touch the device to the headset again. (Unlock the screen of the device if it is locked.)
For devices that do not support a one-touch connection (NFC): Operate from the Bluetooth device.
When disconnected, you will hear voice guidance saying, “BLUETOOTH disconnected.”

Turn off the headset:
You will hear voice guidance saying, “Power off.”

Hint: When you finish playing music, the Bluetooth connection may terminate automatically depending on the Bluetooth device.

Listening to Music from a Device via Bluetooth Connection

If your Bluetooth device supports the following profiles, you can enjoy listening to music and perform basic remote control operations via a Bluetooth connection.

A2DP (Advanced Audio Distribution Profile)
You can enjoy high-quality music wirelessly.
AVRCP (Audio Video Remote Control Profile)
You can adjust the volume, etc.

Note: The operation may vary depending on the Bluetooth device. Refer to the operating instructions supplied with your Bluetooth device.

Connect the headset to a Bluetooth device.
Wear the headset.
Adjust the length of the headband.
Put the headset with the indication to the left and the indication to the right. The unit of the headset has a tactile dot.
A: Tactile dot
Playback music or video on the Bluetooth device.
Adjust the volume on the Bluetooth device.
Adjust the volume by pressing the +/- buttons of the headset.
When the volume reaches the maximum or minimum, an alarm sounds.

Hint

The headset supports SCMS-T content protection. You can enjoy music, etc., from a device such as a mobile phone or portable TV that supports SCMS-T content protection.
Depending on the Bluetooth device, it may be necessary to adjust the volume or set the audio output setting on the Bluetooth device.
Volume during a call and volume during music playback can be adjusted independently. Changing the call volume does not change the volume of music playback, and vice versa.

Note
If the communication condition is poor, the Bluetooth device may react incorrectly to the operation on the headset.

Setup Guide

To get started with the Sony Stereo Headset WH-CH400, follow these simple steps:

Fully charge the headset using the provided USB cable.
Turn on the headset by sliding the power button until the LED indicator flashes blue.
Enable Bluetooth on your desired device and search for available devices.
Select "WH-CH400" from the list of devices to pair the headset with your device.
Once connected, you can control your music, calls, and volume using the integrated buttons on the headset.

Controlling the audio device

(Bluetooth connection)

If the Bluetooth device supports AVRCP, you can control it on the headset. The functions available may vary depending on the Bluetooth device. Refer to the operating instructions supplied with your Bluetooth device.

controlling_the_audio_device_sony_stereo_headset_wh-ch400.png

Each button has the following function:

Press once during pause to start playback.
Press once during playback to pause.
Adjust the volume.
Press and hold until you hear a beep to skip to the beginning of the next track/beginning of the previous track (or the current track during playback). After releasing the button, press within 1 second to skip to the beginning of the next/previous track and hear a beep (you can repeat this operation).

Note
If the communication condition is poor, the Bluetooth device may react incorrectly to the operation on the headset. The available functions may vary depending on the Bluetooth device. When you operate as illustrated above, it may operate differently or may not work at all.

Disconnecting Bluetooth connection

(After use)

If using a device that supports one-touch connection (NFC), touch the device to the headset again. (Unlock the screen of the device if it is locked.) If using a device that does not support one-touch connection (NFC), operate from the Bluetooth device.
When disconnected, you will hear a voice guidance “BLUETOOTH disconnected”.
Turn off the headset.
You will hear a voice guidance “Power off”.

Using the Voice Assist Function

(Google App)
By using the Google App feature on an Android smartphone, you can speak to the headset’s microphone to operate the smartphone.

Set up the Google App:
Go to [Settings] — [Apps], then select the gear icon in the top-right corner of the display. Choose [Default Apps] — [Assist & Voice input] — [Assist App], and set [Assist App] to the Google App.
Connect the headset to the Android smartphone via Bluetooth.
Activate Google App:
When the smartphone is in standby or playing music, press the button two times in 0.5 seconds. The Google App will activate, and you will hear a start-up sound.

Hint
When you finish playing music, the Bluetooth connection may terminate automatically depending on the Bluetooth device.

Using the voice assist function

(Google App)

By using the Google App feature that comes with the Android smartphone, you can speak to the headset’s microphone to operate the Android smartphone.
- Set assistant and voice input settings on the Google App.
- On the Android smartphone, select [Settings] — [Apps], then select the gear icon that appears in the top-right corner of the display.
- Then, select [Default Apps] — [Assist & Voice input] — [Assist App], and then set [Assist App] to the Google App. The above procedure is an example. For details, refer to the operating instructions of the Android smartphone.
  Note: The latest version of the app may be required.
- For details on the Google App, refer to the operating instructions or the support website of the Android smartphone, or the Google Play store website. The Google App may not be activated from the headset depending on the specifications of the Android smartphone.
Connect the headset to the Android smartphone via Bluetooth connection.
When the Android smartphone is on standby or playing music, press the button two times in 0.5 seconds to activate the Google App.
The Google App is activated and you will hear the start-up sound.
Make a request to the Google App through the headset’s microphone.
For details on the Google App, such as apps that work with the Google App, refer to the operating instructions of the Android smartphone. After activating the Google App, when a certain time has passed without requests, a beep will sound and the Google App will be deactivated.

Note
The Google App cannot be activated when you say “OK Google” through the headset’s microphone even when the Android smartphone’s [OK Google] setting is on.

Using the voice assist function

(Siri)
By using the Siri feature that comes with iPhone, you can speak to the headset’s microphone to operate the iPhone.

Turn Siri on.
On iPhone, select [Settings] — [Siri] to turn Siri on.
The operation above is an example. For details, refer to the operating instructions of the iPhone.
Note: For details on Siri, refer to the operating instructions or support website of the iPhone.
Connect the headset to the iPhone via Bluetooth connection.
While the iPhone is connected to the headset using Bluetooth connection and in standby or playing music, press the button two times in 0.5 seconds.
Siri is activated and you will hear the start-up sound.
Make a request to Siri through the headset’s microphone.
For details on Siri, such as apps which work with Siri, refer to the operating instructions of the iPhone.
To continue to request, press the button before Siri is deactivated. After activating Siri, when a certain time has passed without requests, a beep will sound and Siri will be deactivated.

Note
Siri cannot be activated when you say “Hey Siri” through the headset’s microphone even when the iPhone’s [Allow “Hey Siri”] the setting is on.

Troubleshooting

Sound skips frequently

Remove any obstacles between the antenna of the Bluetooth device to be connected and the built-in antenna of the headset. The antenna of the headset is built into the part shown in the dotted line below.
A: Location of the built-in antenna
Bluetooth communications may be disabled, or noise or audio dropout may occur under the following conditions.
- When there is a human body between the headset and the Bluetooth device
- Put the Bluetooth device in the same direction as the antenna of the headset to improve the Bluetooth communications.
- There is an obstacle, such as metal or a wall, between the headset and the Bluetooth device.
- In places with wireless LAN, where a microwave oven is used, electromagnetic waves are generated, etc.
The situation may be improved by changing the wireless playback quality settings or fixing the wireless playback mode to SBC on the transmitting device. For details, refer to the operating instructions supplied with the transmitting device.
Because Bluetooth devices and Wi-Fi (IEEE802.11b/g/n) use the same frequency (2.4 GHz), microwave interference may occur resulting in noise or audio dropout or communications being disabled if this headset is used near a Wi-Fi device. In such a case, perform the following.
- Use this headset at least 10 m (30 feet) away from the Wi-Fi device.
- If this headset is used within 10 m (30 feet) of a Wi-Fi device, turn off the Wi-Fi device.
- Use this headset and the Bluetooth device as near to each other as possible.
If you are enjoying music with your smartphone, the situation may be improved by shutting down unnecessary apps or restarting your smartphone.

The Bluetooth wireless communication range is short, or the sound skip

Remove any obstacles between the antenna of the Bluetooth device to be connected and the built-in antenna of the headset. The antenna of the headset is built into the part shown in the dotted line below.
A: Location of the built-in antenna
Bluetooth communications may be disabled, or noise or audio dropout may occur under the following conditions.
- When there is a human body between the headset and the Bluetooth device
- Put the Bluetooth device in the same direction as the antenna of the headset to improve the Bluetooth communications.
- There is an obstacle, such as metal or a wall, between the headset and the Bluetooth device.
- In places with wireless LAN, where a microwave oven is used, electromagnetic waves are generated, etc.
The situation may be improved by changing the wireless playback quality settings or fixing the wireless playback mode to SBC on the transmitting device. For details, refer to the operating instructions supplied with the transmitting device.
Because Bluetooth devices and Wi-Fi (IEEE802.11b/g/n) use the same frequency (2.4 GHz), microwave interference may occur resulting in noise or audio dropout or communications being disabled if this headset is used near a Wi-Fi device. In such a case, perform the following.
- Use this headset at least 10 m (30 feet) away from the Wi-Fi device.
- If this headset is used within 10 m (30 feet) of a Wi-Fi device, turn off the Wi-Fi device.
- Install this headset and the Bluetooth device as near to each other as possible.
If you are enjoying music with your smartphone, the situation may be improved by shutting down unnecessary apps or restarting your smartphone.

Pros & Cons

Pros

Affordable price
Lightweight and comfortable design
Seamless Bluetooth connectivity
Long battery life
Integrated microphone with echo cancellation

Cons

Limited noise cancellation capability
No support for hi-res audio codecs

Customer Reviews

Users love the convenience, affordability, and sound quality of the Sony Stereo Headset WH-CH400. Most reviews mention the headset's excellent battery life and comfortable fit. However, some users have raised concerns about the headset's limited noise cancellation and lack of support for hi-res audio codecs.

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