Mace™ Motion Alert is a passive infrared home security system that detects motion in any selected area. Compact and attractive, it mounts easily (vertically or horizontally) near any entry area and is battery operated, eliminating any need for wiring. Security system unit can be coded with a personal security code and can be set to utilize a two-tone entry chime, instead of the alarm sound. Mounting screws and AC connector included. 9-volt battery not included.