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VSB MinusNine

Ultra-miniature Noise Free Wireless Earphone with swing-tray battery faceplate



The MinusNine VSB wireless earphone is a revolution in covert communications technology with a physical profile so small that it can be fitted deep into the ear canal making it imperceptible by others as well as comfortable for use in the most challenging special operations. MinusNine VSB exploits a technology called Vestigial Sideband Modulation to transmit audio signals over a short range from a neck loop or flatpack without responding to power or data borne interference. This (patent pending) technology is unique in this type of device and not susceptible to eavesdropping or external masking keeping communications secure and reliable. A range of neckloops and shoulderpads are available which can include PTT switches and microphones as well as a car loop amplifier.


Frequency Range: 300-3000Hz

DSP Type: Custom Hybrid, DSP and EEPROM

Distortion: <3% @ 1kHz

Receive:r Magnetic

Maximum Output Sound Pressure Level (2cc coupler) @1kHz: 96dB or preset to customer specification

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) 66dB@1kHZ ±3dB/10mA/M

Amplifier: Digital Hybrid with custom Hardware + Firmware

Weight (including battery): 1.2 grams

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

Wax Filter Type: Replaceable Mesh Filter

Colour Options: Beige, Mid Brown, Dark Brown.

Custom Fit Option

CE Conformity 89/336/EWG-Electromagnetic Compatibility

ROHS & WEE ROHS: Compliant. WEE: 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.