An ordinary telephone socket that any telephone equipment can be connected to,Conceals transmitter.

No need of technical or professional knowledge - simply plug it to one of the extensions (with a phone cord) and you're set.

While operating can't be detect by both parties on the line.

The transmitter is high - reliability fm modulated hybrid circuit.

Frequency operation is 433 MHz crystal controlled fm narrow band.

No antenna required. No battery required (Powered by line current).

Extremely difficult to detect - nil current consumption during on hook operation .

Audio bandwidth: 20 Hz to 30 kHz. Range up to 1500 feet in open area.

Automatically transmits the conversation between both parties on the line to a receiver immediately a conversation begins.

You can use any extension (not only the one that the transmitter is connected to), for full operation.