In-Ear Headset

CX 275s

The CX 275s is a high-quality in-ear headset that is compatible with all major smartphone and tablet brands and delivers Sennheiser quality sound on the go. Find out what German engineering is all about.
£ 49.99
incl. VAT – free shipping
Article No. 504538
★ ★ ★ ★ ☆ 4.1
30 Reviews


With Sennheiser’s CX 275s universal in-ear mobile music and communications headset, you can hear Sennheiser quality sound on the go, regardless of which smartphone or tablet you have. Their high-powered dynamic speaker systems provides for an outstanding audio performance while ear adaptors in different sizes allows for an excellent ear canal fit and ambient noise attenuation. Full control is also achieved with the in-line microphone and remote for the easy management of calls and tracks.

The Sennheiser CX 275s headset is compatible with all major smartphone and tablet brands like Apple iPhone, Samsung, HTC, Sony, Nokia, Blackberry, etc.
Click here to check the compatibility with your smartphone


  • Fits All – compatible with virtually all major smartphone and tablet brands, e.g. Apple iPhone, Samsung, HTC, Sony, Nokia, Blackberry, etc.*

  • Signature Sennheiser sound - high powered dynamic speaker systems for great bass-driven stereo sound

  • Premium comfort - ear adaptors in different sizes for excellent ear canal fit and ambient noise attenuation

  • Intuitive design - highly-aesthetic, ergonomic design

  • Ease of use - integrated microphone and smart remote for enhanced usability

  • Convenience at its best - storage pouch for hassle-free portability

  • Peace of mind – two-year international warranty

What's in the box?

  • CX 275s headset
  • Adaptor
  • Ear adaptor sets
  • Storage pouch

Technical Data

  • Impedance
    16 Ω
  • Connector
    3,5mm plug, 4 pole
  • Frequency response (Microphone)
    100 – 10.000 Hz
  • Frequency response (Headphones)
    17 - 23000 Hz
  • Sound pressure level (SPL)
    121 dB
  • Ear coupling
  • Cable length
    1.2 m
  • Transducer principle
    dynamic, closed
  • Weight
    15 g
  • Pick-up pattern
  • Sensitivity
    -44 dB
Reviews (30)
4.1 of 5 ★ ★ ★ ★
  • cheKozaro
    Toronto, Canada
    MASSIVE value

    I honestly can't believe the quality of sound for the price, best value cans I think I've ever had, you can't go wrong with this pair But doesn't specify what is left/right ears and the extra 'adapter' cord, what is it for?? no instructions on options for the button


    Very Good Fit, Hq Full Spectrum Sound, Amazing Price, Great Bass


    Extra Cord No Details, Yeah Whats Left Or Right, Cord Is A Bit Thin Flimsy, Yeah What's Leftright


    Office, Commute, Travel


    I would recommend this to a friend.

  • Arnov Sett
    New Delhi
    Highly Satisfied

    The great thing about CX 275s is that it provides solution to accessory support for different devices by the additional cord supplied by it. So I can run it any device. I hear a lot of Trance while travelling and I'm very satisfied with its sound quality. Also for videos with low sound pitch this is perfect. Only thing bothers me are its thin wires; my earlier ear phones were damaged due to same issue. Just have to stay cautious with handling while travelling. Rest, its a great investment.


    Lightweight, Good Bass, Great Sound


    Flimsy Construction, Too Thin Wires


    Portable Devices, Music, Traveling


    I would recommend this to a friend.

  • Mark the CEO
    Great headphones

    Great headphones - I also had B&O and Bose - and find these Sennheiser's the most comfortable, good quality and extremely good value (a fifth of the cost of my B&O headphones and 10 times better!)


    Compact, Good Value, Comfortable, Durable




    I would not recommend this to a friend.


  • What Sennheiser headsets are compatible with PlayStation 4 (PS4)?

    The Sennheiser PC analog headsets (ie: headsets with dual 3.5 mm plugs) can be used with the PCV 05 Combo Audio Adaptor to plug directly into the PS4 Dual shock controller. When connected with the PCV 05 the game audio and chat functions will work. Sound settings have to be adjusted in the PS4. NOTE: The Sennheiser PC analog headsets include the G4ME ZERO, G4ME ONE, PC 363D (without USB adapter), PC 360, PC 350 SE, PC 330, PC 320, PC 310 and PC 151.

    The Sennheiser U320 can be connected directly to the USB port of the PS4. The game volume setting will control the volume of both chat and the game however the chat volume setting on the headset will not work. Sound settings have to be adjusted in the PS4.

    The Sennheiser USB headsets will work when plugged directly into the PS4 USB port. However the gaming USB models that come with the 3D G4ME 1 sound card will work as stereo headsets. The 3D sound function is not available. Sound settings have to be adjusted in the PS4. NOTE: The Sennheiser USB headsets include the PC 363D, PC 333D, PC 323D and the Internet Telephony models (PC 8 USB and SC 260 USB). 

    The Sennheiser Mobile Gaming headsets are also compatible with the PS4 when plugged into the PS4 Dual shock controller. The in-line volume control (if included) will work on PS4 but the answer/end button has no function. Sound settings have to be adjusted in the PS4. NOTE: The Sennheiser Mobile Gaming headsets include the HD 335s, HD 429s, MM 70s, HD 219s, CX 275s.

    CX 275s ( #504538 )
  • Foam Ear Adapters

    A good source for foam ear adapters for the majority of Sennheiser ear bud models is a company called Comply Foam (

    CX 275s ( #504538 )
  • What headphones have a UNIVERSAL microphone for smart phones?

    The headphone models that we currently offer with a built in universal microphone which will work with the majority of devices are as follows:

    - CX 275s - Ear-canal headset with bass-driven stereo sound and excellent noise isolation.

    - MM 70s - Ear-canal headset with lifelike sound, noise-isolating design and volume slider.

    - HD 219s - On-the-ear headset with plush earpads and vibrant sound.

    - HD 335s - Over-the-ear headset with a DJ style flip up right ear-cup.

    - HD 429s - Around-the-ear headset with powerful bass and ambient noise isolation.

    Each model is a unique wearing style and has individual features. 

    Alternatively Sennheiser offers a range of Telecom headsets ( which can be connected to a 3.5 mm headphone jack on a cell phone via the CBB01 cable.

    NOTE: For any of our headphones that have a model number that ends in a lower case "i" the integrated microphone/control is specifically designed for Apple products and will NOT work with a non-Apple product. If one of these models was connected to a non-Apple device there would be sound through the headphones but no functionality of the controls.

    CX 275s ( #504538 )


  • EU Declaration of Conformity
    • EU Declaration of Conformity Ear-canal Phones (290 KB) Download