Smoke Detector with Built-In Transmitter

For use with Silent Call receivers Very simple to install and battery powered. If the smoke detector is "set off" the built-in transmitter sends a signal to any 318MHz Silent Call receiver. Sends a signal up to 500 feet away depending on the receiver used. Uses one 3V lithium battery (included). Three year manufacturer's warranty on smoke detector and five year manufacturer's warranty on Silent Call transmitter board.