This is an extremely tiny telephone transmitter that can be installed anywhere along the telephone line or inside sockets or the telephone itself When the telephone is in use, it will transmit both sides of the conversation with crystal clarity up to 300 metres away. It requires no batteries as it is line powered and will monitor all extensions regardless of its location. For best results use with our SAB 9  Airband Receiver

Suitable for , USA, Canada, Australia and most other countries telephone systems

SIZE: 15mm. X 8mm. X 3mm..FREQUENCY: l00MHz-125MHz. ANTENNA: Built in. POWER: Line powered: 15mm. X 8mm. X 3mm..FREQUENCY: l00MHz-125MHz. ANTENNA: Built in. POWER: Line powered

Not suitable for office and P.A.B.X systems