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DCM-40 Digital Soft Squelch

Standard Digital inductive wireless earphones in left or right ear fitting

Different models to fit the left or right ear (right is most popular) in beige, mid brown or dark brown. The roll-top battery tray also functions as an on/off switch. These products need to be used with an inductive transmission accessory.



The DCM-40 is a miniature, inductively-coupled wireless earphone utilising an advanced digital microelectronics platform running custom software. It produces outstanding speech quality, reduced interference levels, precise output level control and is anatomically profiled to fit deep into the ear canal making it discreet, secure and usable in the left or right ear. Special functions include soft-squelch, automatic gain control and low battery alarm. The DCM-40 is robust and designed to operate in hostile environments and incorporates a hygienic user-replaceable cerumen (earwax) filter system. Design emphasis has been placed on its ability to suppress interference; typically generated by data systems in vehicles, TDMA noise from TETRA/P25 terminals and Cellphones as well as mains-borne noise from electric motors, neon signs and power lines. A full range of compatible neckloops, shoulder loops and brooch inductive transmitters is available to operate with the DCM-40wireless earphone.



Frequency Range: 300-3000Hz

DSP Type: Digital Hybrid, DSP and EEPROM with custom Firmware & Software

Distortion: <10% @ 1kHz

Receiver: Magnetic moving armature

Max Output Sound Pressure Level (2cc coupler) @1kHz:96dB ±2dB or preset to customer requirement

Quiescent Noise Control (no audio input): Soft Squelch. Hard Squelch option

Quiescent Noise (Soft Squelch): 35dB (With hard squelch option quiescent is silent)

End of Battery Life: Audible Beep

Battery: 1.4 VDC A10 Zinc Air or Equivalent

Minimum Operating Voltage: 1.1 VDC

Typical Battery Life (A10 Zinc Air):>50 hours

Sensitivity (Standard): 75dB@1kHZ ±3dB/10mA/M

Size: Nominal max, Length:15mm x Width:8mm

Weight (including battery): 1.75 grams inc. battery

Operating Temperature Range: -10°C to +40°C

Cerumen Filter Type: Replaceable Mesh Filter

Colour Options: Beige, Mid Brown, Dark Brown

Custom Fit Option: Available at additional charge. Ear impressions required

CE Conformity: 89/336/EWG-Electromagnetic Compatibility

ROHS & WEEE: ROHS: Compliant. WEEE: Compliant

Contact Us

Sensorcom Ltd.

London, BR3 4LZ, 

United Kingdom

Tel: +44 (0) 208 639 4440

Fax: +44 (0) 208 639 4442

E-Mail: info@sensorcom.com 


The MEL Group

Laurence Walter House

Addison Road, Chilton Ind. Est,

Sudbury, Suffolk

CO10 2YW, UK


BSI registered

Holds Certificate No: FM 561435 and operates a Quality Management System which complies with the requirements of ISO 9001:2008 for the following scope:

The design, manufacture, repair and supply of audio communication devices, assisted listening devices and a range of associated products and accessories.


The “end of life disposal” of electrical products  in an environmentally friendly way, is the responsibility of the Purchaser.