Your cart
Contact us
Close contact box
Connect ID #
973 438 86
Connect ID #
973 438 86
All finished with your chat session?

We’ll email you a transcript of this conversation for your records.

All of our representatives are
currently chatting with other customers.

Please enter your name.  
Please enter a valid email address. Why is this required?

For Tech Support, call 1-888-292-2575

All web chat conversations are recorded. We use automated technology to connect you with an Advisor and to answer some common questions. If you do not consent, please do not continue with chat assistance.

Thank you, !
Our conversation will be emailed to
Chat Advisor Image

Your Advisor,

More about me
Please enter a question  
Don't wait on hold. We'll call you back when it's your turn to talk with the next available .
Please enter your name  
Please enter your phone number  
Please enter a message  

Calls may be recorded for training and quality control purposes.

We are located in Virginia USA.

Sennheiser CX Plus True Wireless

Noise-canceling Bluetooth® earbuds (Black)

Item # 143CXPTWB

100% wire-free earbuds with noise cancellation and Sennheiser's dynamic, outside-the-head sound.

100% wire-free earbuds with noise cancellation and Sennheiser's dynamic, outside-the-head sound.

Item # 143CXPTWB

In stock

Other options

Since 1974

Years of experience making people happy.

Hands-on research

We double check the details on each item.

60-day price protection

We’ll reimburse you if the price drops.

About the Sennheiser CX Plus True Wireless

Jeff Miller

Signature Sennheiser sound and noise cancellation for less

The Sennheiser CX Plus true wireless earbuds offer a lot of what makes the premium Momentum TW 2 in-ears so special. Sennheiser went with a more straight-forward, stripped-down design — but these sweat-proof earbuds still feel incredibly light. And they include some of our customers' favourite features, like active noise cancellation.  
Woman wearing Sennheiser CX Plus earbuds

The value-packed Sennheiser CX Plus true wireless earbuds give you touch control over noise cancellation or quickly hearing external sounds.

Signature Sennheiser sound and noise cancellation for less

The Sennheiser CX Plus true wireless earbuds offer a lot of what makes the premium Momentum TW 2 in-ears so special. Sennheiser went with a more straight-forward, stripped-down design — but these sweat-proof earbuds still feel incredibly light. And they include some of our customers' favourite features, like active noise cancellation.  

And then there is Sennheiser's smooth, spacious sound. The CX Plus earbuds include the 7mm "TrueResponse" drivers — a simplified version of the dynamic drivers found in their top-of-the-line IE900 in-ear headphones. Music plays wirelessly via the newer Bluetooth 5.2 version, and the pairing process with my phone was seamless. There is no connecting wire between the two earbuds, and you can control music or calls by touch.

Good noise cancellation for earbuds 

I've only had time to briefly audition these earbuds, but I found they cancel noise well for earbuds. In general, active noise cancellation doesn't work as well with in-ear headphones as it does with over-ear headphones. But these earbuds offer a lot of noise isolation just from the fit alone.

I didn't put them through an extreme noise test, but the HVAC system above my desk can get loud. And with the noise-canceling circuitry on, I didn't notice it at all. It provided a nice blanket of quiet, so they drivers could do their thing while I listened to music or podcasts.

Responsive touch controls and a quick way to hear others

The earbuds turned on automatically when I put them in. Once paired to my phone, you control music and calls by touching or tapping either earbud.  Controls are snappy, and the touch pad is not as sensitive or finicky as it is in some other small earbuds.

Tapping the left earbud once toggles between noise cancellation and "Transparent Hearing" function. The latter turns off your music and noise-canceling circuitry and uses the built-in mics to pick up external sounds. That way I could quickly hear co-workers without removing the earbuds. 

Sennheiser CX Plus true wireless earbuds with case

The included charging case banks 16 hours of power to recharge headphones.

Secure, stable fit

These earbuds slip right into place with a slight twist and are designed to keep stable as you move your head. Sennheiser includes four sizes of silicone ear tips for finding the right fit. That helps for comfort and also ensures you have a tight seal for proper imaging and strong bass punch. 

Charging case banks hours of power

The ultra-light earbuds arrive packed in a compact charging case. It's lightweight, functional hard plastic — small enough to pocket, but durable enough to drop in a bag. You get about eight hours of listening and noise cancellation on a single charge, and the case banks enough power to recharge the earbuds twice while you're on the move. 


Product highlights:

  • 100% wire-free headphones
    • no connecting cord between left and right earbuds
  • active noise cancellation uses internal circuitry to reduce external distractions
  • Transparent Hearing Mode lets you hear external sounds
  • "TrueResponse" 7mm dynamic driver in each earbud
    • spacious, cohesive sound with precise imaging
  • IPX4 water-resistant design
Wireless audio:
  • Bluetooth version 5.2 for wireless music listening and phone calls
    • aptX® and AAC decoding provides high-quality music streaming from compatible devices
  • free Sennheiser Smart Control app for Apple® and Android™ allows you to adjust settings and customize the sound
    • "Bass Boost" sound preset for deeper low-end emphasis
Battery and charging info:
  • built-in rechargeable batteries offers 8 hours of listening with noise cancellation
  • carrying case banks up to 16 hours of power to wirelessly recharge headphones
  • USB-A to USB-C cable included for charging case
General info and specs:
  • includes 4 sizes of silicone ear tips for a customized, comfortable fit
  • touch controls on each earbud let you answer calls and control music
    • access Siri or Google Assistant voice controls assistants from your phone
  • beam-forming dual-microphone system for clear phone calls
  • frequency response: 5-21,000 Hz
  • weight: 0.42 ounces (both earbuds)
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # 509188

What's in the box:

  • Left and right wireless ear buds (black)
  • Charging case (black)
  • 4 Pairs of silicone ear tips (1 pair installed)
  • 10" USB charging cable (Type A USB on one end and USB-C on other end)
  • Quick Guide/Welcome
  • Safety Instructions
  • EU Compliance Information
  • Thank you card

Customer reviews

Loading reviews...

Sennheiser CX Plus True Wireless reviews

Average review:

12 reviews

Filter by rating

Customer photos

Sort reviews

Sort by:
Items per page:
View page:

Verified customer (What's this?)
Verified employee review (What's this?)

Reviewed on

This review was collected as part of a promotion



Crutchfield response

<< >>

More details on the Sennheiser CX Plus True Wireless

Mark G.

Features & specs

Fit Style True Wireless
Earcup Type Closed
Earcup Width x Height 0.713" x 0.84"
Noise-canceling Yes
Bluetooth Yes
Bluetooth Version 5.2
Single-earbud Operation No
Mic For Taking Calls Yes
Voice Assistant Access
Amazon Alexa Yes
Google Assistant Yes
Siri Yes
3.5mm No
1/4" No
Lightning No
4.4mm balanced No
XLR4 balanced No
2.5mm No
Other None
Frequency Response 5-21k Hz
Sensitivity 114 dB
Impedance N/A
Weight 0.423 ounces
Cord Length N/A
Parts Warranty 2 Years
Labor Warranty 2 Years

Product Research


Overview: The Sennheiser CX Plus True Wireless in-ear headphones (CXPLUSTW1) are two individual ear buds with no connecting wires. They connect to your smartphone or tablet (and to each other) via Bluetooth. Four pairs of silicone ear tips (XS, S, M, L) are included for a comfortable fit. The CX Plus True Wireless headphones come with a charging case for storage, and for recharging the batteries.

Drivers: The CX Plus True Wireless features 7mm TrueResponse dynamic transducers that deliver high-fidelity sound with clear treble, natural midrange, and deep bass. You can tailor the sound using the equalizer found in the Sennheiser Smart Control app, available for iOS and Android devices.

Active Noise Cancellation: Active Noise Cancellation (ANC) lets you immerse yourself in your music or phone call without the distraction of external noise. In-ear headphones typically provide effective passive isolation from ambient noise. When ANC is activated, a microphone on each earbud picks up and effectively reduces external noise, particularly continuous low-frequency noise, such as a fan or motor. You can use ANC even when you aren't listening to music to create a quiet space in a noisy environment.

Transparent Hearing Function: The Transparent Hearing function lets you hear ambient sounds or have short conversations without removing the ear buds. The built-in microphones pick up the external sounds to help you stay aware of your surroundings, hear public announcements at the train station or airport, or carry on a conversation while continuing to wear the ear buds. You can adjust the level of Transparent Hearing using the Sennheiser Smart Control app.

Bluetooth 5.2: The CX Plus True Wireless headphones feature Bluetooth version 5.2 which pairs to your phone or audio device in seconds. You can make and receive phone calls and stream audio wirelessly in a range of up to 33' (10 meters), depending upon environmental conditions. The headphones have a maximum of 10mW of output power, and have the following profiles: Hands-Free Profile (HFP), Audio/Video Remote Control Profile (AVRCP), and Advanced Audio Distribution Profile (A2DP). If your audio source supports aptX, aptX Adaptive, or AAC, music is automatically played in high audio quality. Otherwise, the headphones will play in standard audio quality (SBC).

Voice Assistants: The ear buds are compatible with the voice assistant that is activated to your smartphone, such as Siri or Google Assistant. Tapping the right ear bud 3 times activates the voice assistant for you to make a request or ask a question. You can also activate voice dialing through the voice assistant.

Voice Prompts: The ear buds output voice prompts to confirm events or headphone status. These voice prompts include "Power on," "Power off," "Connected," "No connection," "Pairing," "Pairing successful," "Pairing failed," "Recharge headset," "Call rejected," or "Call ended." In the Smart Control app, you can change the language of the voice prompts, choose between voice prompts and beep sounds, or deactivate some of the status messages.

Rechargeable Batteries: The CX Plus True Wireless headphones are powered by built-in 3.7VDC Lithium-Ion rechargeable batteries. Each earbud's has a 55 mAh battery, while the charging case has a 400-420 mAh battery. The complete charging cycle of the charging case and earphones is approximately 1.5 hours. A 10-minute Quick Charge provides about 1 hour of playback time. The battery in the charging case charges via USB-C power (5V, 600 mA) using the supplied cable from a laptop, an AC-powered USB charging port, or a mobile 12-volt USB charging port. Fully-charged batteries in the earbuds provide approximately 8 hours playback. The charging case provides enough stored power to charge the earbuds approximately 2 additional times, to extend the playback time to 24 hours.

Phone/Music Controls: Controls for music playback and phone call functions are located on separate earbuds. Both earbuds are equipped with touch-sensitive controls. You can control the volume up (hold right) or down (hold left). Music playback controls include play/pause (1x right), previous track (2x left), and next track (2x right). Phone call functions can be controlled on either the left or right earbud: accept call (1x), end call (1x), or reject call (2x). When you're on a call and another call comes in, you can tap either earbud to accept (1x) or reject (2x) the incoming call. Additional functions that can be controlled include voice assistant (3x right), Active Noise Cancelling (3x left), and Transparent Hearing Function (1x left).

Microphones: The CX Plus True Wireless earbuds are equipped with a dual microphone system in a beam-forming array. This pickup pattern helps to reduce ambient noise. The microphones have a 100Hz to 10kHz frequency response.

Sidetone Function: When using the CX Plus ear buds for phone calls, you may find it more comfortable to hear your own voice in the ear buds. The Sidetone function plays your audio through the ear buds during a phone call. You can activate or deactivate the function, or adjust the settings, in the Smart Control app.

Smart Control App: In addition to the on-board controls, the CX Plus True Wireless in-ear headphones can be controlled by Sennheiser's Smart Control app for Android and iOS devices. The app lets you customize the ear buds' on-board controls as you desire. Firmware updates for the earphones are also available through the app. The Smart Control app is compatible with iOS devices running version 13.0 and later, and Android devices with version 8.0 and up.


  • Frequency Response: 5Hz - 21kHz
  • Transducer Size: 7mm
  • Total Harmonic Distortion (THD): <0.08% (1kHz, 94dB)
  • Sound Pressure Level (SPL): 114dB (1 kHz/0dBFS)
  • Microphone:
    • Frequency Response: 100Hz - 10kHz
    • Pickup Pattern: 2-mic array for Active Noise Cancellation per ear bud
  • Dimensions:
    • Earbuds: 0.713" (w) x 0.84" (h) x 1.05" (d)
    • Charging Case: 2.32" (w) x 1.67" (h) x 1.332" (d)
  • Weight:
    • Earbuds: 0.212 ounces (each); 0.423 ounces (pair)
    • Charging Case: 1.23 ounces (1.66 oz with earbuds)

Loading accessories...

Customer Q&A

Loading articles...

Compare the sound