Signature Series Sound Monitor 418 MHz Transmitter (SM5-SS) Accessories Model SD4-MC Where there's smoke

Model SD4-MC  Where there's smoke

Signals when a monitored door or window is opened

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

Model DB2-MC You have a visitor

With its simple pin jack

Signature Series Sound Monitor 418 MHz Transmitter (SM5-SS) Accessories Model SD4-MC Where there's smokeAlert 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