CPI TTP1/2 Tone Termination Panel is a reliable interface between a tone remote system and a two-way radio base station. It provides PTT (push-to-talk) and monitor functions, allowing you to remotely control the radio and monitor transmissions. The TTP1/2 can be used with any tone remote that uses the industry-standard EIA sequential tone format. It supports various configurations, including board-only options (TTP1, TTP2) and models with metal enclosures (-C suffix). For four-wire operation, the -4W suffix is available, and the -FD suffix provides full-duplex operation on four wires. Installation is straightforward, with modular connections for phone lines and screw terminals for radio connections. External power is supplied via a 12 to 16 volt semi-regulated DC power supply.