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Sennheiser CX 400BT Series User Manual

Sennheiser CX 400BT Series
36 pages
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CX 400BT True Wireless
True wireless stereo earphones
Model: CX400TW1, CX400TW1 R, CX400TW1 L, CX400TW1 C
Instruction manual
Use the search function, the navigation (left) or the following links:
Start
“Product overview”
“Getting started”
“Using the earphones”
“FAQ/If a problem occurs ...
“Specifications”
Sennheiser electronic GmbH & Co. KG
Am Labor 1
30900 Wedemark
Germany
www.sennheiser.com
Version: 09/20 A01
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Sennheiser CX 400BT Series Specifications

General IconGeneral
Frequency Response5 Hz - 21 kHz
Bluetooth Version5.1
Battery Life7 hours (earbuds), 20 hours (with charging case)
Driver TypeDynamic
Sound Pressure Level (SPL)107 dB (1 kHz / 0 dBFS)
THD (Total Harmonic Distortion)< 0.08 % (1 kHz / 94 dB)
Bluetooth ProfilesA2DP, AVRCP, HFP
CodecSBC, AAC, aptX
MicrophoneYes
Touch ControlsYes
TypeIn-ear
Charging Time1.5 hours
Weight6 g (earbud)
Water ResistanceIPX4

Summary

Important safety instructions

Health and accident prevention

Protect hearing from high volume and avoid deep ear insertion.

Product damage prevention

Keep dry, avoid extreme temperatures, use only approved accessories.

Lithium battery safety warnings

Risks of explosion, fire, heat from abused rechargeable batteries.

Data and firmware notes

Data collection and processing

Explains data collected for operation and firmware updates.

Product intended use and liability

Intended use definition

Defines product use for wireless audio communication like music and calls.

Package contents

Included accessories and guides

Lists earbuds, charging case, USB cable, ear adapters, quick/safety guides.

Product overview

Charging case components

Details charging case LED, buttons, compartments, and magnetic holders.

Earbud components

Describes earbud touch controls, LEDs, microphones, and battery.

Charging case LED status

Explains LED indicators for charging and error states of the charging case.

Earbud LED status

Details LED indicators for earbud pairing, connection, and battery status.

Voice prompts and sounds

Lists voice prompts for events like power on, connection, and low battery.

Getting started

Initial wake-up and charging

How to wake up earbuds/case and initiate charging.

Selecting ear adapters for fit

Guide to choosing ear adapters for optimal sound quality and comfort.

Connecting to Bluetooth device

Steps to pair the earphones with a Bluetooth device.

Installing Smart Control app

Instructions to download and install the Sennheiser Smart Control app.

Using the earphones

Battery life and first use

Information on battery life, charging process, and initial setup recommendations.

Charging the battery

Step-by-step guide to charging the earbuds and charging case via USB.

Bluetooth connection information

Details on Bluetooth 5.1 compatibility and pairing devices.

Pairing with Bluetooth devices

Information on establishing Bluetooth wireless connection with devices.

Pairing process

Step-by-step instructions for pairing earphones with a smartphone or other Bluetooth device.

Switching Bluetooth connections

How to switch audio connection between paired Bluetooth devices.

Disconnecting Bluetooth devices

Procedure to disconnect earphones from a Bluetooth device.

Earbud-to-earbud pairing

Optional steps to re-pair the left and right earbuds if necessary.

Smart Control app setup and use

Guide to installing and connecting the Smart Control app for advanced features.

Ear adapter fitting and insertion

Guide on choosing ear adapters and properly inserting earbuds for optimal fit.

Powering earphones on and off

How to turn the earphones on and off, including automatic idle mode.

Adjusting volume levels

Instructions on how to increase or decrease the volume using touch controls.

Voice assistant and dialing

How to activate and use the smartphone's voice assistant with the earphones.

Music playback control

Manage music playback functions like play, pause, next, and previous tracks.

Call management

Handle incoming and outgoing calls, including accepting, rejecting, and ending calls.

Auto Call function settings

Configure automatic call acceptance when earbuds are removed from the case.

Displaying battery charge status

Check battery status of earbuds and charging case via device or case.

Sound effects and equalizer settings

Customize sound profiles and use equalizer settings via the Smart Control app.

Voice prompts and beep sounds

Configure voice prompts, beep sounds, and status messages.

Control function customization

Customize touch control functions for music playback and operations.

Storing and transporting earphones

Proper storage of earphones in the charging case to prevent damage.

Care and maintenance

Cleaning and maintenance guide

Instructions on cleaning the product, ear adapters, and charging contacts.

Replacing ear adapters

Guide on how to replace ear adapters for hygiene and optimal fit.

Built-in rechargeable battery info

Information regarding battery performance and handling of defects.

Firmware update installation

Steps to download and install firmware updates using the Smart Control app.

FAQ and troubleshooting

Bluetooth connection issues

Information on leaving the Bluetooth transmission range and connection problems.

Factory reset procedure

Steps to reset the earphones to factory default settings to resolve issues.

Specifications

General technical data

Detailed technical specifications for wearing style, frequency response, power, etc.

Bluetooth technical data

Details on Bluetooth version, transmission frequency, modulation, and codecs.

Manufacturer Declarations

Warranty and compliance

Details about product warranty, EU conformity, and safety directives.

Disposal instructions

Guidance on proper disposal of the product, batteries, and packaging.

Trademarks

List of registered trademarks and logos used in the documentation.

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