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Audiotel
Covert transmitter and receiver

In the mid-1980s, Audiotel International Ltd. (UK) produced a series of body wearable covert radio systems. The systems consisted of a transmitter (TX) and a separate receiver (RX) that were small enough to be hidden under a person's clothing. Covert radios like this are often used for surveillance tasks and VIP protection. The image below shows a typical RX/TX pair.
 
The unit on the left is the VRX-SL receiver. The one on the right is the VTX-22 transmitter. Each unit has its own battery and a piece of wire that is used as the antenna. A variety of different types of microphone was available for the transmitter, ranging from a small concealed one, to microphones with a separate push-to-talk (PTT) switch.   
VRX-SL receiver (left) and VTX-22 transmitter (right)

 
VRX-SL receiver (left) and VTX-22 transmitter (right)

 
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