Swann Driveway Alert Alarm (SWHOM-DRIVEA-GL) Pir Wireless Sensor Detects Motion & Receiver Turns On Alarm/Chime Wireless RF Transmission Up To 200 Feet Water-Resistant Outdoor Pir Includes Volume Switch, Alarm/chime/off Select Switch & Low Battery Led Indicator for Transmitter & Receiver Compatible with DC Adaptor (not Included) for Receiver Unit