Sony WI-C400 User Manual

Help Guide
Wireless Stereo Headset
WI-C400
Use this manual if you encounter any problems, or have any questions.
This Help Guide is also available as a PDF, which can be downloaded here.
Getting started
What you can do with the BLUETOOTH function
About voice guidance
Supplied accessories
Checking the package contents
Replacing the earbuds
Adjusting the cable length
Parts and controls
Location and function of parts
About the indicator
Power/Charging
Charging the headset
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Sony WI-C400 Specifications

General

Foldable	No
Headset type	Binaural
Product type	Headset
On/off switch	Yes
Product color	Red
Wearing style	In-ear, Neck-band
Recommended usage	Calls/Music
Connectivity technology	Wireless
Driver unit	9 mm
Magnet type	Neodymium
Ear coupling	Intraaural
Headphone frequency	8 - 22000 Hz
Cables included	Micro-USB
Battery recharge time	4.5 h
Continuous audio playback time	20 h
Microphone type	Built-in

Weight and Dimensions

Weight	35 g

Summary

Getting Started with Your Headset

What you can do with the BLUETOOTH function

Explains the headset's dual capabilities for music and calls via Bluetooth.

About voice guidance

Details the voice prompts provided by the headset for various operational states.

Supplied accessories

Lists the items included in the product package.

Location and Function of Parts

Identifies and describes the headset's physical components and their functions.

Power and Charging

Covers the procedures for powering on/off and charging the headset.

Bluetooth Connectivity Basics

How to make a wireless connection to BLUETOOTH devices

Outlines the general process for establishing a wireless connection.

One-touch connection (NFC) with a smartphone (Android 4.1 or later)

Detailed guide for NFC pairing with Android smartphones.

Pairing and connecting with an Android smartphone

Step-by-step guide for pairing with Android devices.

Connecting to a paired Android smartphone

Guide to reconnecting to an already paired Android device.

Pairing and connecting with an iPhone

Step-by-step guide for pairing with iPhones.

Connecting to a paired iPhone

Guide to reconnecting to an already paired iPhone.

Pairing and connecting with a computer (Windows 10)

Instructions for pairing with Windows 10 computers.

Connecting to a paired computer (Windows 10)

Guide to reconnecting with a paired Windows 10 computer.

Pairing and connecting with a computer (Windows 8/Windows 8.1)

Instructions for pairing with Windows 8/8.1 computers.

Connecting to a paired computer (Windows 8/Windows 8.1)

Guide to reconnecting with a paired Windows 8/8.1 computer.

Pairing and connecting with a computer (Windows 7)

Instructions for pairing with Windows 7 computers.

Connecting to a paired computer (Windows 7)

Guide to reconnecting with a paired Windows 7 computer.

Pairing and connecting with other BLUETOOTH devices

Instructions for pairing with generic Bluetooth devices.

Connecting to a paired BLUETOOTH device

Guide to reconnecting with an already paired Bluetooth device.

Disconnecting BLUETOOTH connection (after use)

Instructions for disconnecting Bluetooth after use.

Audio and Call Operations

Listening to music from a device via BLUETOOTH connection

Detailed guide on playing music from a Bluetooth device.

Controlling the audio device (BLUETOOTH connection)

Explains how to control playback and volume via Bluetooth.

Supported codecs

Explains the audio codecs (SBC, AAC) supported by the headset.

Receiving a call

Step-by-step instructions for answering incoming calls.

Making a call

Step-by-step instructions for initiating calls.

Functions for a phone call

Details advanced call functions for HFP and HSP profiles.

Voice Assist Features

Using the voice assist function (Google App)

Guide for using Google Assistant with Android phones.

Using the voice assist function (Siri)

Guide for using Siri with iPhones.

Troubleshooting

What can I do to solve a problem?

General troubleshooting steps for common issues.

The headset is not turned on.

Troubleshooting steps for when the headset fails to power on.

Charging cannot be done.

Troubleshooting steps for when the headset fails to charge.

Charging time is too long.

Troubleshooting steps for excessively long charging times.

The remaining battery charge of the headset is not displayed on the screen of an iPhone or iPod touch.

Explains why battery level may not display on iOS devices.

No sound

Troubleshooting steps for when there is no audio output.

Low sound level

Troubleshooting steps for when the audio volume is too low.

Low sound quality

Troubleshooting steps for poor audio quality.

Sound skips frequently during playback.

Troubleshooting steps for audio stuttering or skipping.

Pairing cannot be done.

Troubleshooting steps for when Bluetooth pairing fails to complete.

Unable to connect the headset to a BLUETOOTH device with one-touch connection (NFC)

Troubleshooting steps for NFC pairing failures.

Unable to make a BLUETOOTH connection

Troubleshooting steps for general Bluetooth connection failures.

Distorted sound

Troubleshooting steps for audio distortion.

The BLUETOOTH wireless communication range is short, or the sound skips.

Troubleshooting steps for short range or audio skips due to interference.

The headset does not operate properly.

General troubleshooting for headset malfunction.

No voice from callers

Troubleshooting steps for not hearing the other party during calls.

Low voice from callers

Troubleshooting steps for low volume from the other party during calls.

Maintenance and Settings

Resetting the headset

Instructions on how to reset the headset.

Initializing the headset to restore factory settings

Instructions on how to perform a factory reset.

Important Information

Precautions

General safety, usage, and environmental precautions for the headset.

Trademarks

Lists registered trademarks and their owners.

Customer support websites

Provides links to Sony's customer support resources for various regions.

Product Specifications and Usage

Available operating time

Provides information on the headset's battery life under different usage conditions.

Checking the remaining battery charge

Explains how to check the headset's battery level.

System requirements for battery charge using USB

Lists the system requirements for charging the headset via USB.

Turning on the headset

Step-by-step guide to powering on the headset.

Turning off the headset

Instructions for powering off the headset.