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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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Table of Contents
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Summarization of Contents
Getting Started and Basic Headset Operations
What You Can Do with the BLUETOOTH Function
Explains the headset's basic functions using Bluetooth technology for music and calls.
Understanding Voice Guidance
Details the audio prompts provided by the headset for various operations like power, connection, and battery status.
Package Contents and Earbud Fitting
Lists included items and guides on replacing earbuds for a better and more secure fit.
Headset Parts and Controls Overview
Identifies and explains the function of each part, button, and indicator on the headset.
Charging the Headset and Checking Battery Status
Instructions for charging the headset via USB and how to check the remaining battery levels.
Connecting Your Headset via Bluetooth
How to Make a Wireless Connection
General steps for establishing a Bluetooth connection between the headset and various devices.
NFC One-Touch Pairing for Android Devices
Guide for connecting Android devices using NFC for quick and easy pairing.
Manual Pairing with Smartphones and Computers
Steps for pairing with Android, iPhone, and Windows devices using traditional Bluetooth methods.
Reconnecting to Paired Devices
Instructions for reconnecting to previously paired smartphones, computers, or other Bluetooth devices.
Using Your Headset for Music and Calls
Wireless Music Playback and Control
How to play music wirelessly and control playback functions like volume and track skipping.
Supported Audio Codecs
Information on the audio coding algorithms (SBC and AAC) supported by the headset for music transmission.
Managing Phone Calls
Steps for receiving, making, and handling phone calls, including answering and ending calls.
Utilizing Voice Assistants (Google App & Siri)
Instructions for activating and using voice assistants like Google Assistant or Siri via the headset's microphone.
Troubleshooting Common Headset Issues
General Troubleshooting Steps
A guide to resolving common headset problems by following listed actions and checking FAQs.
Resolving Power, Charging, and Battery Display Problems
Solutions for issues related to headset power, charging failures, and incorrect battery status display.
Addressing Sound and Bluetooth Connectivity Issues
Troubleshooting for no sound, low volume, poor quality, skipping, distorted sound, and pairing errors.
Resetting and Initializing the Headset
Procedures to reset or restore the headset to factory settings to fix persistent malfunctions.
Important Information, Precautions, and Support
Safety Precautions and Usage Guidelines
Important safety information and recommendations for using the headset in various environments.
Trademarks and Customer Support Information
Lists official trademarks and provides links to Sony's customer support websites for further assistance.
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