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Black in-ear headphones with neckband and four-button remote

Sennheiser

Sennheiser CX 350BT Black Bluetooth 5.0 In-Ear Headphone

SKU CH-4JZJ-EQS2D

Bluetooth 5.0 in-ear headphones with AAC, SBC, AptX and AptX Low Latency codecs, a four-button remote, 10-hour battery life, USB-C charging and the Smart Control app for equalizer and firmware updates

  • TypeIn-Ear
  • ColorBlack
  • Frequency Response17Hz-20KHz (-10 dB)
  • THD0.5% (1 kHz, 100 dB SPL)
  • Input Impedance28 ohms
  • ConnectorUSB-C (Charging)
  • Bluetooth 5.0 multi-point pairing connects two devices simultaneously
  • Four-button remote controls music, calls and voice assistants
  • AptX Low Latency codec reduces audio delay for video
  • Up to 10 hours playback with USB-C fast charging
  • Smart Control app adds equalizer, podcast mode and firmware updates

Built for wireless listening

The Sennheiser CX 350BT is a canal-type in-ear headphone weighing 13g. It connects through Bluetooth 5.0 and supports SBC, AAC, AptX and AptX Low Latency codecs. A four-button remote handles music, calls and voice assistants such as Siri and Google Assistant. Battery life reaches up to 10 hours with SBC playback.

Fits daily carry with minimal gear

The earphones charge through a USB-C connector and ship with four ear adapter sizes (XS/S/M/L) for a secure seal. Multi-connection pairing lets the set stay linked to two devices at once. The Smart Control app adds an equalizer, podcast mode, battery status and firmware updates without extra hardware.

Suits commuters wanting codec flexibility

Listeners who prefer over-ear comfort or need active noise cancellation should look elsewhere. Buyers requiring longer continuous playtime beyond 10 hours or a wired audio connection will not find those features here. The package includes only the earphones, adapters, a USB-C cable and guides.

Highlights

  • Bluetooth 5.0 multi-point pairing connects two devices simultaneously
  • Four-button remote controls music, calls and voice assistants
  • AptX Low Latency codec reduces audio delay for video
  • Up to 10 hours playback with USB-C fast charging
  • Smart Control app adds equalizer, podcast mode and firmware updates

Specifications

BrandSennheiser
ModelCX 350BT Black
TypeIn-Ear
ColorBlack
Frequency Response17Hz-20KHz (-10 dB)
THD0.5% (1 kHz, 100 dB SPL)
Input Impedance28 ohms
ConnectorUSB-C (Charging)
Ear CouplingCanal
Weight13g
Wireless TypeBluetooth Version: 5.0
Supported Profiles: A2DP, AVRCP, HSP, HFP
Codecs: SBC, AAC, AptX, AptX Low Latency
Operating TimeUp to 10 hours (SBC)
Package ContentsCX 350BT earphones
Ear adapter set (XS/S/M/L)
USB-C charging cable
Quick Guide
Safety Guide

Questions about this item

How long does the battery last at full volume with SBC?

Up to 10 hours of operating time is quoted for SBC playback.

Does the neckband get warm or noisy during all-day use?

The 13 g in-ear design has no fan or active cooling, so it stays silent and barely warm.

What source device and port are needed to charge the case?

Any USB-C power source and the supplied USB-C cable will charge the earphones.

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