The Auto Dialer is a unique passive infrared system that monitors motion in an area you select. When the unit is ARMED, the motion detector watches the protected area. Once movement is detected, a 105db security alarm will sound and the Auto Dialer will call up to 5 preset telephone numbers selected by you. The Auto Dialer can also be used in Chime mode, such as in a store, where a chime will alert you when motion is detected. The Auto Dialer is easy to set-up. Install a 9 volt battery (not included), connect the AC adaptor and telephone line (included). Then mount the Auto Dialer to the desired location 5-6 feet above the floor.