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CX 120BT Wireless


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Sennheiser’s CX 120BT earphones deliver clear audio and wireless freedom in a compact go-anywhere design. Their detailed and balanced sound can be enjoyed without compromise, thanks to SBC, aptX™ and aptX™ Low Latency compatibility, as well as Bluetooth 4.1 for reliable connectivity. With a comfortable, around the neck design, three-button remote for effortless calls and audio control as well as 6 hours battery life, it’s never been simpler to enjoy great sound.

Key Features : 

  • High-quality audio with aptX™ and SBC codec support and additional aptX™ Low Latency

  • Bluetooth 4.1 technology for seamless connectivity

  • 6 hours of battery life, with 1.5 hour to charge via micro USB

  • Call and music management via intuitive three-button remote

  • Designed for comfort with three interchangeable ear tip sizes included for optimal fit and sound isolation

  • Ergonomic cable around-the-neck design for a secure, comfortable fit
  • 2-year warranty

Technical Data :

Ear coupling

Ear canal

Wearing style (cable)

Bluetooth® neck cable


Approx. 14 g (0.5 oz)

Frequency response

17 – 21,000 Hz (-10 dB)

Transducer principle


Transducer size

10 mm

Sound pressure level (SPL)

112 dB (1 kHz/0 dBFS)

THD (1 kHz, 100 dB)

< 0.5 % (1 kHz, 100 dB SPL)

Mic principle


Mic frequency response

100 – 8,000 Hz

Mic sensitivity (as per ITU-T P.79)

-42 dB V/Pa

Mic pick-up pattern (speech)


Power supply

Built-in Lithium-Polymer rechargeable battery: 3.7 V ⎓, 100mAh; USB charging: 5 V ⎓, 500 mA max

Operating time

Up to 6 hours (A2DP) 8.5 hours (HFP)

Charging time of rechargeable batteries

Approx. 1.5 hrs


Bluetooth 4.1, class 1

Transmission frequency

2,402 MHz to 2,480 MHz




SBC, aptX ™, aptX ™ Low Latency

Dimensions product packaging (L x W x H)

87 x 40 x 125 mm
(3.4 x 1.5 x 4.9 in)

Weight of headset and packaging

78.3 g (2.7 oz)

Dimensions of outer master carton
(L x W x H)

292 x 222 x 192 mm
(11.4 x 8.7 x 7.5 in)

Total weight of outer master carton & products

2,433.6 g
(5.3 lbs)

What's in the box?

  • CX 120BT earphones
  • Ear adapter set (S/M/L)
  • Micro USB charging cable
  • Quick Guide
  • Safety Guide

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