The HOMESAFE WIRELESS HOME SECURITY SENSOR is for use with the HOMESAFE WIRELESS HOME SECURITY SYSTEM. This sensor will detect vibration and the opening of a door or window. It can transmit wirelessly up to 300 feet through walls. Requires one nine volt battery (not included).
A necessary accessory
Review by G. P. on Feb 07, 2011
The HomeSafe wireless system only comes with one door/window security sensor so we bought this for the back door. Works great!