The ultimate spy equipment is the one that can be used wirelessly from a distance of up to 1000 meters. It can be one way (with a spy pen transmitter and a portable receiver) or two way (with spy pen transmitter, spy earpiece receiver and portable transceiver) all in UHF FM band.
One way communication system, is the one that allows the communication from A point to B point, in a distance of up to 1000 meters. See more about it here: Spy bug pen transmitter.
The two way communication system, allows the communication from A to B, but also, from B point to A point, in a area of up to 1000 meters. See more about it here: Covert communication system.
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