Signature Series Sound Monitor 418 MHz Transmitter (SM5-SS) Accessories Assure yourself of power in

Assure yourself of power in case of an electrical failure with the Backup Battery Pack

Easy to install and powered by the doorbell’s electrical circuit

With its simple pin jack

neighbor or delivery person is at your door

Model SD4-MC  Where there's smoke

Signature Series Sound Monitor 418 MHz Transmitter (SM5-SS) Accessories Assure yourself of power inAlert yourself to a babys cry, door buzzer, alarm clock or oven timer. Whatever the noise, the Signature Series Sound Monitor Transmitter will notify you of it. When a sound is detected, it broadcasts a signal to any Silent Call Signature Series Receiver. A delay circuit prevents activation by brief noises such as a slamming door, and a sensitivity control lets you adjust the sound threshold at which it activates. Fully portable, it operates on two AA