Are there better that the 400bt true wireless ?

With Sennheiser sound is the #1 consideration and both the CX True Wireless and CX 400BT True Wireless provide amazing sound quality so either is an excellent choice for sound. The CX True Wireless does offer a few additional features: 1) Bass Boost ... so you can get your music really pumped up. 2) Role Switching ... so you can use one ear bud at a time or both together. 3) Adjustable Sidetone ... so you can hear your own voice during calls. 4) Smaller ergonomic design ... so you can get a more snug fit in the ear for great passive noise cancelling. 5) 27 hour battery life ... so you can have your music all day. Have a great day.

On the underside of the earbud there is a small piece of material over the charging contacts. What is this for and should I remove it?

On the underside of the earbuds there is a protective covering over the charging contact points to prevent the earbuds from powering on before they are ready to be used. You need to remove this protective covering prior to charging otherwise the earbuds won't be able to power on. Have a great day.

Can you use just the left earbud by itself?

YES!!! The earbuds feature "role switching" which lets you use each earbud separately or together as a pair. The added benefits to using only one earbud at a time is that you can hear what's going on around you (ie: if you are walking do the street) and one ear bud can be charging so your music is always ready to go. Have a great day.

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Sennheiser CX True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls with Passive Noise Cancellation, Customizable Touch Controls, Bass Boost, IPX4 and 27-hour Battery Life, Black

Sennheiser CX True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls with Passive Noise Cancellation, Customizable Touch Controls, Bass Boost, IPX4 and 27-hour Battery Life, Black

Product ID: 335992539

Details

Brand
Sennheiser
Color
Black
Ear Placement
On Ear
Form Factor
In Ear
Impedance
36 ohm

🎧7mm TrueResponse drivers

💧IPX4 splash resistance

🔋27-hour battery life

Description

🎶 Elevate your sound game—because average just won’t do.

CONTROL YOUR VIBE - Customizable touch controls and Smart Control app let you personalize sound and calls effortlessly.
READY FOR ANY MOMENT - IPX4 splash resistance means your earbuds keep up with your active lifestyle, rain or shine.
ALL DAY POWER NO PAUSE - Up to 27 hours of uninterrupted music with fast on-the-go charging.
PRECISION ENGINEERED SOUND - German-made 7mm TrueResponse drivers deliver crystal-clear audio and deep bass.
TAILORED FIT TOTAL COMFORT - Ergonomic design with 4 ear tip sizes ensures secure fit and passive noise cancellation.

The Sennheiser CX True Wireless Earbuds combine premium German-engineered 7mm drivers with a sleek ergonomic design, delivering up to 27 hours of playback with on-the-go charging. Featuring passive noise cancellation, customizable touch controls via the Smart Control app, and IPX4 splash resistance, these earbuds offer a tailored, high-fidelity audio experience perfect for professionals on the move.

Specifications

ASIN	B08ZR5JB9G
Additional Features	Lightweight, Water Resistant
Age Range Description	Adult
Antenna Location	Listen to music, during sports
Audio Driver Size	7 millimeters
Audio Driver Type	Dynamic Driver
Battery Average Life	27 hours
Battery Charge Time	1.5 hour
Best Sellers Rank	#62,015 in Electronics ( See Top 100 in Electronics ) #2,726 in Earbud & In-Ear Headphones
Bluetooth Range	10 meters
Bluetooth Version	5
Brand Name	Sennheiser
Built-In Media	What's in the box: Sennheiser CX True Wireless In-Ear Earbuds (Black), Charging
Cable Features	Without Cable
Carrying Case Battery Average Life	27 hours
Carrying Case Color	Black
Carrying Case Material	Plastic
Color	Black
Compatible Devices	Cellphones, Computers, Tablets, Gaming Consoles
Connectivity Technology	Wireless
Control Method	Touch, Voice
Control Type	Touch Control
Controller Type	Voice Control
Customer Reviews	3.9 3.9 out of 5 stars (2,789)
Earpiece Shape	Rounded tip
Enclosure Material	Plastic
Frequency Range	5 Hz to 21 kHz
Global Trade Identification Number	00615104355040
Headphone Folding Features	In Ear
Headphone Jack	No Jack
Headphones Ear Placement	On Ear
Impedance	36 ohm
Item Weight	1.76 ounces
Manufacturer	Sennheiser
Model Name	CX True Wireless
Model Number	CX200TW1 BLACK
Noise Control	Passive Noise Cancellation
Number of Items	4
Sensitivity	110 db
Specific Uses For Product	Multi-Purpose
Style Name	True wireless earphone
Subject Character	no characters
Theme	No theme
Total USB 2.0 Ports	1
UPC	615104355040
Unit Count	1 Count
Warranty Description	2 year manufacturer
Water Resistance Level	Water Resistant
Wireless Technology	Bluetooth, True Wireless

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