This scheme is a device for removing speech information from the premises. During the inspection of the client’s office, it was discovered in the cavity between the drywall and the main wall behind the 220B network outlet.
In general, there are no strange components in the device. Another confirmation of the modern trend of using conventional radio-electronic components to provide a certain functionality. A clear sign of this is the use of a 4G modem with a SIM card as a transmitter.
