Audio transmitters | Transfer in 220V network
The principle of monitoring vests in modulation of audio signal to carrier wave of a high frequency and it is transmitted by network circuit of 220V. Demodulation of that signal to a normal speech is insured by a special decoding device. The transmission is possible to a distance of tens up to hundreds of meters from monitored room even through walls and obstacles of the object, so as the signal is emitted through the 220V network circuit and it is possible to receive it in various places !!!
The remote control of some devices makes it impossible to discover the transmitter !!!
Direct visibility to the monitored object is not a prerequisite.
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