The compact design of the Swann Keypad Alarm with Programmable Indoor Siren allows you to install the unit where it is most convenient. Swann Keypad Alarm with Programmable Indoor Siren, SW351-KCH: * Add security without the high-priced hassle of a big monitored system * Do-it-yourself, easy to install * Alerts anyone attempting to come through a secured entrance * Audible alarm * Compact design