The Wireless 1000 Annunciator system is a wireless chime for indoor and outdoor applications. Its wireless PIR detector has detection patterns for doorway and driveway coverage. Just insert a 9V battery and mount the detector wherever you want detection, then plug in the chimebox receiver to complete the installation. Installs anywhere quickly and easily. Ideal for detecting approaching vehicles and people, alerting visitors to your home or shop, and activating a variety of electronic equipment i.e. doorstrikes, magnetic locks, sirens, motors, etc.