Sennheiser CX 350BT Review

  • -Sennheiser-CX-350BT-Wireless
  • CX-350BT
  • Sennheiser-CX-350BT-Wireless-Earphones

Quick Points

  • Fit: In Ear
  • Enclosure: Closed Back
  • Connectivity: Wireless
  • Best For: iOS & Android
  • Noise Canceling: No
  • Microphone: Yes


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What Comes Inside The Box

  • Sennheiser CX 350BT Earphones
  • Charging Cable
  • 4 X Silicone Ear Adapters
  • Sennheiser CX 350BT User Manual
  • Warranty Card

Our Score

  • 7

Reasons Why You Should Buy Them

  • The Sennheiser CX 350BT has a unique and lightweight design that makes them portable and less visible during everyday activities than a round-the-neck model
  • The Sennheiser CX 350 BT Wireless provides a very good sound quality compared to other in-ear models. The bass is deep and punchy, but there is no feeling of excess, complimented by detailed midrange and crisp, clear treble
  • Built-in controls and microphone allow you to answer phone calls, control music playback, adjust volume levels, skiptracks, turn on pairing mode, power on/off, check battery status and connect with Google Assistant, Siri or Baidu
  • The Sennheiser Smart Control app lets you control your headphones even more, such as ability to change equalizer settings, selectvoice assistant, choose podcast mode for optimized speech, firmware updates and check battery status
  • Sennheiser has included four different sizes of silicone tips in the packaging to help you find the most comfortable fit
  • Battery life of up to 10 hours is considerably solid compared to competing models that offer an average of 6-8 hours on a single charge
  • Thanks to the USB Type-C charging connector, which has become the standard for most Android models these days, you only need to carry one charging cable while traveling
  • Compatible with high-quality codecs such as aptX, aptX LL, AAC and SBC, you can listen to your favorite songs with high-resolution audio quality
  • There is no problem with the quality of the calls. The people on the other side of the call hear your voice clearly even in a moderately noisy environment
  • With Bluetooth 5.0, you can seamlessly connect and switch between multiple devices. You can answer calls on your smartphone while listening to music on a laptop
  • There are two standard color options to choose from: Black and White depending on your preferences

Reasons Why You Should Avoid Them

  • If you like heavy bass genres like Rap, Mettle, Jazz, then these in-ear headphones are not for you, better opt for Sony or Beats headphones
  • The bass and treble are good as long as you have a good fit, otherwise they sound thinner than they should
  • The two earbuds are fastened with a cable that appears a little short for some people with a larger neck
  • For some users, Sennheiser cx 350bt wireless earphone may not stay in the ears due to the lack of optional fins or hooks to keep them stable in the ears
  • It's just the color that looks good, the quality of the earbuds, the cable and the remote control feels a little cheap
  • The Sennheiser cx 350bt in ear headphones are not suitable for running or heavy exercise, as they keep jumping down your ears and there's nothing to hold them
  • A carrying case or pouch is not included in the packaging, which is somewhat disappointing
  • There is no “auto pause” feature when take them off from your ears, which makes them a little less convenient
  • Since there is no automatic shutdown mode, the battery will be completely discharged if the earphones are left connected
  • There is no official IPX rating that indicates how much water and dust resistant these earphones are
  • There are no magnets inside the earbuds like Beats X to clamp them around your neck when not in use


  • Advanced wireless Bluetooth 5.0 technology with seamless connectivity
  • Effortless multi-connection pairing for two devices simultaneously
  • Four-button remote to control music playback, answer calls and connect to voice assistants
  • Dedicated voice assistant button to connect to Google Assistant, Siri, or Baidu
  • AAC, SBC, AptX, and AptX LL codec support for superior sound quality
  • Up to 10 hours of long battery life and fast USB Type-C charging connector
  • Sennheiser Smart Control App for customizing sound output and firmware updates
  • Included four different sizes of silicone tips for a comfortable fit
  • Available color options: Black and White

The Specs That Matter


  • Headphone Fit : In Ear
  • Enclosure : Closed Back
  • Size In/Cm : Flexible
  • Weight Gm/Oz : 13 g (0.46 oz)
  • Foldable Design : Yes


  • Connectivity : Bluetooth
  • Connect Multiple Devices : Yes
  • On Device Controls : No
  • In Line Mic & Controls : Power, Pair, Call, Hold, Volume, Mute, Play/Pause, Skip Tracks, Voice Assistant
  • Voice Assistant : Google Assistant + Siri + Baidu
  • Companion App : Sennheiser Smart Control App


  • Noise Cancelation Type : No
  • Sound Isolation : Yes
  • Echo Reduction : No
  • Sound Mode : Stereo
  • Volume limiting : No


  • Water/Sweat Resistant : No
  • Waterproof : No
  • Heart Rate Monitor : No
  • Step Tracking : No


  • Battery Life : Up To 10 Hours
  • Auto Pause & Play : No
  • Auto Shut-Off : No
  • Quick Charge : No

Technical Data

  • Driver Size : 9.7 mm
  • Driver Unit : Dynamic
  • Impedance (OHM) : 28 Ohm
  • Frequency Response : 17 Hz - 20000 Hz
  • Sensitivity (dB/mW) : 110 dB/mW
  • Total Harmonic Distortion @ 90 dB : Less than 0.5%
  • Total Harmonic Distortion @ 100 dB : Less than 0.5%
  • Supported Codecs : aptX, aptX LL, AAC, SBC


  • Bluetooth Version : 5.0
  • Bluetooth Profiles : A2DP, AVRCP, HFP, HSP
  • Radio Frequency : 2.4 GHz
  • Wireless Range : Up To 10 m (33 ft)
  • NFC : No

Noise Canceling

  • Noise Canceling Adjustment : No
  • Noise Canceling ON/Off Switch : No
  • Atmospheric Pressure Optimizing : No
  • Ambient Sound Mode : No

Audio Cable

  • Detachable Audio Cable : No


  • Microphone Feature : On-board MEMS, Omni Directional Microphone
  • Microphone Sensitivity : 42 dB/mW
  • Microphone Frequency Response : 100 Hz - 8000 Hz


  • Battery : Rechargeable Lithium-Polymer
  • Charge Time : 2.5 Hours
  • Charging Cable : Type-C Cable
  • Battery Indicator : Yes
  • Operating & Storage Temperature : 41°F - 104°F


  • Connection : Wireless
  • Audio : Yes
  • Microphone : Yes
  • Controls : Yes


  • Connection : Wireless`
  • Audio : Yes
  • Microphone : Yes
  • Controls : Yes


  • Connection : Wireless
  • Audio : Yes
  • Microphone : Yes
  • Controls : Limited


  • Connection : No
  • Audio : No
  • Microphone : No
  • Controls : No


  • Connection : No
  • Audio : No
  • Microphone : No
  • Controls : No

TV & Home Theater

  • Connection : No
  • Audio : No
  • Microphone : No
  • Controls : No

User Manuals

Service & Support Info

  • Manufacturer's Warranty on Parts : 2 Years Limited Warranty
  • Manufacturer's Warranty on Labour : 2 Years Limited Warranty
  • Helpline : 1 (877) 736-6434
  • Contact : Click Here


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