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Miniature UHF transmitter for use in a room or vehicle. This voice activated transmitter will transmit conversations to a distant receiver.
With our Automatic Gain Control system it will pick up a whisper 40 feet away from the transmitter microphone as clearly as loud speech near it.
Exceptional audio quality.


  • Ultra miniature size.
  • CR2032 Lithium battery.
  • Voice activation system starts transmission only on voice signal detection to maximize battery lifetime up to 600 hours.
  • Shock resistant indestructible design.
  • Extremely sensitive built-in microphone.
  • Automatic microphone gain control.
  • Crystal frequency control.

Technical data

Size: 20x20x3.5mm (0.8"x0.8"x0.14") without battery
        20x20x7mm (0.8"x0.8"x0.28") including battery
Range: 500 meters (1700 feet) in open field
           200 meters (700 feet) in a city
Power requirement: 2 - 3 V
Battery type: CR2032 (DL2032 compatible)
Battery lifetime: 24 h in transmit mode
                       600 h in standby mode
Output power: 5 mW (0.1 - 10 mW on demand)
Frequency: 433 - 434 MHz (300 - 434 MHz on demand)
Modulation type: NFM
Operating temperature: -20 to +60 °C (-4 to 140 °F)

* each UHF transmitter works on a separate frequency channel so several of them can be used sumultaneously.

** if you would like to order transmitters working on different frequencies, or you need different output power, please contact us and provide your requirements.

SMV-20 UHF Voice Activated transmitter
The transmitter size in comparison to coins Side view of the transmitter with a battery
Click here to view more photos

  Price: $245.00
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Note: All transmitters are supplied on the strick understanding that they will be operated in a lawful manner. It is the purchasers responsibility to comply with the laws in their countries. We decline any resposibility for use of these devices. For more information read the Terms of Sale.
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