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The BS121 base station is compatible with the DX121 digital wireless system.


  • 2.4GHz license-free operation
  • 1 full-duplex and 3 additional push-to-transmit beltpacks
  • Up to 8 systems can be linked together
  • Interface option available to 4-wire intercom systems only
  • Portable, compact design
  • Built-in battery charger

Item Code

CZ11465: DX121 system without headset

CZ11464: DX121 system with WH200 headset

CZ11462: DX121 system with HS15 headset

CZ12027: BS121 base station EU version (ETSI compatible)


Frequency Range: 2400-2483.5MHz

Frequency Response: 200Hz to 3.5kHz

Power Requirements: 100–240V AC, 50-60Hz or 12-14V DC

Temperature Range: -4-131°F (-20-55°C) Typ.

Size: 1.62 x 5.50 x 7.88in (4.1 x 14 x 20cm)

Weight: 1.2lbs (0.59kg) with battery

4-Wire I/O: 600Ω  balanced, level adjustment

Headset I/O: 200Ω  balanced, level adjustment

Antenna Type: External, dual diversity ½-wave dipole (R-TNC connector)

System Distortion: <2%

Communication Security: 64-bit encryption dual slot diversity

Transmission Modes: Continuous (Latched) or Push-to-Talk (PTT)

Transmitter Specifications

Type: Frequency-Hopping, Spread Spectrum (FHSS)

Transmit Power:  100mw Burst

Modulation Type: Gaussian filtered FSK, TDM

Frequency Stability: 13 ppm

Harmonics/Spurious: Exceeds FCC and ETSI specifications over temperature

Receiver Specifications

Type: Frequency-Hopping, Spread Spectrum (FHSS)

RF Sensitivity: <-90dBm w 10-3 BER

Frequency Stability: 13 ppm

Distortion: 2%

FCC License: Not Required

ETSI Compatibility as of January 1, 2015

The European Telecommunications Standards Institute (ETSI) has mandated a change in the way wireless products operate in the 2.4GHz bands. This new directive, EN 300 328 v1.8.1, requires Clear-Com to modify its HME DX-Series wireless intercom products and ship only v1.8.1 compliant products into countries that require CE compliance, beginning January 1, 2015.

What is EN 300 328 v1.8.1?

A new ETSI standard to address interference issues within the 2.4GHz ISM band. The main changes relate to how devices communicate and allocate radio space when they are in the same area. A new \"adaptive mode\" is required, which provides a mechanism so equipment can adapt to its environment by identifying other transmissions present in the 2.4GHz band.

How will this affect Clear-Com HME DX-Series products?

Clear-Com has modified its HME DX-Series wireless intercom products to be v1.8.1 compliant and created new model numbers for products sold in EU countries. New HME DX-Series EU Model Numbers available here. How do I determine if my BP200, BP 210, WH200, WH220 will work with new EU compliant base stations? Check the G number, which is located on label under the battery, and cross reference to chart above.


Characteristics of new v1.8.1 compliant product:

  • Spectrum-friendly feature will no longer be available.
  • New beltpacks will be backwards compatible with older versions of the base stations.
  • Older versions of beltpacks will not work with new base stations.
  • Testing is more important when installing in order to determine antenna placement and coverage area, particularly when other 2.4GHz equipment is nearby.

Ready to get

Our team of communications professionals are here to support your project. Contact us today to start designing your custom intercom solution.

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