Bug for listening to phone lines + receiver   (ID: B13)

Disconnect one end of the telephone line, plug this device and you then you can listen to all the calls going on the landline phone. It is without batteries, because is powered directly from the telephone line, this device can actually transmit signal indefinitely.
With the special receiver in the 400 MHz band you can set the exact frequency, so that you can get the most clear sound possible. The frequency is fixed, preset and written on the device.
The great transmission power allows for tapping the signal up to 200 meters away even in the presence of obstacles. The receiver works with rechargeable lithium-ion battery 7.2V. There are 30 preset channels for quick setup and fine tuning with 50 kHz steps.