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SENNHEISER CX True Wireless Earbuds Manual

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SENNHEISER CX True Wireless Earbuds Manual

SENNHEISER CX True Wireless Earbuds Product image

Important safety instructions

  • Read this instruction manual carefully and completely before using the product.
  • Always include this instruction manual when passing the product on to third parties.
  • Do not use the product if it is obviously defective or makes loud, unusual (whistling or beeping) noise.
  • Only use the product in environments where Bluetooth® wireless transmission is permitted.

Preventing damage to the product and malfunctions

  • Always keep the product dry and do not expose it to extreme temperatures (hairdryer, heater, extended exposure to sunlight, etc.) to avoid corrosion or deformation. The normal operating temperature is from 0 °C to 40 °C/32 °F to 104 °F.
  • Use only attachments/accessories/spare parts supplied or recommended by Sennheiser.
  • Clean the product only with a soft, dry cloth. Product parts with ingress protection (IP protection rating) can be cleaned with a slightly damp cloth.

If abused or misused, the rechargeable batteries may leak. In extreme cases, they may even present a risk of:

  • explosion,
  • fire development,
  • heat generation,
  • smoke or gas development.

Package contents

SENNHEISER CX True Wireless Earbuds FIG 1

Online you can find:

A list of accessories can be found on the CX True Wireless product page at Alternatively, contact your local Sennheiser partner:

Product overview

Charging case
Model: CX200TW1 C

  1. SENNHEISER CX True Wireless Earbuds FIG 2LED displays the charging process/charge status of the rechargeable battery of the charging case or of the ear-buds (when inserted into the charging case)
  2. Input for USB-C connector for charging the rechargeable batteries
  3. Built-in rechargeable battery for charging the earbuds on the go
  4. Type plate
  5. Charging compartment for the left earbud L
  6. Magnetic holders
  7. Charging compartment for the right earbud R
  8. Charging contacts
  9. Touch control panel
  10. Changeable silicone ear adapters
  11. Left earbud L
  12. Status LED
  13. Charging contacts with magnetic holders Microphones for phone calls
  14. Right earbud R
  15. Openings for acoustic optimization Built-in rechargeable battery

Getting started

Waking up the earbuds and the charging case and charging the rechargeable batteries

  • SENNHEISER CX True Wireless Earbuds FIG 3Upon delivery, the rechargeable batteries of the earbuds and the charging case are in sleep mode and have to be woken up by connecting them to a power source once.
  • Insert the earbuds into the charging case.
  • Connect the USB-C cable to the charging case and to a USB power source (> 14). The earbuds and the charging case are woken up and the rechargeable batteries are being charged. The earbuds are now ready for use.

Using the earbuds

Information on the rechargeable battery, the charging process and the first use The earbuds and the charging case each have a built-in rechargeable battery. The charging case allows you to store the earbuds safely at all times while they are being charged.

  1. SENNHEISER CX True Wireless Earbuds FIG 4Open the charging case by overcoming a slight magnetic resistance and insert the left earbud into the left charging compartment and the right earbud into the right charging compartment. The earbuds are magnetically pulled into the charging compartments.
  2. Connect the USB-C connector of the USB cable to the USB- C socket of the charging case.
  3. Connect the USB-A connector to a corresponding socket of a USB power source (to be ordered separately). Make sure that the USB power source is connected to the power supply system.




Charging case WITH earbuds insertedCharging case WITHOUT earbuds inserted
pulses yellow… earbuds and charging case are being charged… charging case is being charged
lights up green… earbuds and charging case are fully charged… charging case is fully charged




flashes red

… a charging error/ battery error has been detected in at least one earbud (> 31)… a charging error/ battery error has been detected in the charging case (> 31)


Care and maintenance of the earbuds/charging case

Liquids can damage the electronics of the product! Liquids entering the housing of the product can cause a short-circuit and damage the electronics.

  • Keep all liquids far away from the product.
  • Do not use any solvents or cleansing agents.
  • Only clean the charging case with a soft, dry cloth.
  • Clean the earbuds with a slightly damp cloth.
  • You can clean the silicone ear adapters under lukewarm running water. Let the ear adapters air dry at room temperature for at least 12 hours before re-attaching them to the earbuds.
  • Clean the charging contacts on the earbuds and in the charging case from time to time using e.g. a cotton swab.

SENNHEISER CX True Wireless Earbuds FIG 5FAQ/If a problem occurs …

Current list of frequently asked questions (FAQ) Visit the CX True Wireless product page at  There you will find a current list of frequently asked questions (FAQ) and suggested solutions.

Your question has not been answered or the problem persists?

If a problem occurs that is not listed in the FAQ section or if the problem cannot be solved with the proposed solutions, please contact your Sennheiser partner for assistance. To find a Sennheiser partner in your country, search at

Leaving the Bluetooth transmission range

Wireless calling and streaming are only possible in the Bluetooth transmission range of your smartphone. The transmission range largely depends on environmental conditions such as wall thickness, wall composition etc. With a free line of sight, the transmission range of most smartphones and Bluetooth devices is up to 10 meters.


CX True Wireless
Model: CX200TW1, CX200TW1 C, CX200TW1 L, CX200TW1 R

Wearing styleTrue Wireless stereo earbuds
Ear couplingear canal, closed-back
Frequency response5 Hz to 21 kHz
Transducer principledynamic
Transducer size7 mm
Sound pressure level (SPL)110 dB (1 kHz/0dBFS)
THD (1 kHz, 94 dB SPL)< 0.08 %
Microphone principleMEMS
Microphone frequency response100 Hz to 10 kHz
Microphone pick-up pattern (speech audio)2-mic beamforming array
Power supplybuilt-in Lithium rechargeable batteries, 3.7 V

earbuds: 55-72 mash charging case: 400-420 mash

USB charging via USB-C socket of the charging case: 5 V    , 600 mA

Operating time9 hrs. with rechargeable battery of the earbud (test conditions: iPhone within 1 m distance, Bluetooth AAC codec, playback of mixed music, volume level 50 %, no EQ settings);

27 hrs. with rechargeable battery of the charging case

Charging time of rechargeable batteriesapprox. 1.5 hrs.
Temperature rangeoperation: 0 to +40°C

storage: –25 to +70°C

Relative humidityoperation: 10 to 80%, non condensing

storage: 10 to 90 %

Magnetic field strengthearbuds: 64 MT charging case: 177 MT
Weightearbuds: approx. 6 g each charging case: approx. 37 g



VersionBluetooth 5.2 compatible, class 1, BLE
Transmission frequency2,402 MHz to 2,480 MHz
ModulationGFSK, π/4 DQPSK, 8DPSK
ProfilesHFP, AVRCP, A2DP
Output power10 maw (max)
Codecapt®, AAC, SBC


Manufacturer Declarations

Sennheiser electronic GmbH & Co. KG gives a warranty of 24 months on this product. For the current warranty conditions, please visit our website at or contact your Sennheiser partner.

In compliance with the following requirements

  • General Product Safety Directive (2001/95/EC)
  • Compliant to Sound Pressure Limits according to country specific requirements




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