Telephone line audio trasnmitter working with dedicated wired receiver

This spy kit equipped with audio transmitter on telephone twisted pair is designed for wiretapping and transmission of informations on the sub carrier frequencies of a landline phone. The audio transmitter comes as an unpacked module, with external cables for microphone and telephone line connection and is connected in parallel to the telephone line at any point and with any polarity.

The receiver comes as a separate module, housed in a metallic box with leads for telephone line connection, output jacks for earphones and recorder, and an external power supply socket.