Wireless Driveway Alarm With PIR Motion Sensor Detector A unique device that will let you know when someone is coming to visit or a car turns into your driveway. There are two parts to this driveway security system. The transmitter contains a passive infrared (PIR) sensor, which detects moving heat created by a cars engine or a person walking up your drive. The receiver is placed in your home (or office, warehouse etc.). This unit contains a series of LEDs and a small buzzer to let you know when the outside transmitter detects motion so you'll be prepared for a knock at the door or beep in your driveway. Features: - Easy to install, no wiring required - Wireless and weatherproof PIR motion sensor - No mains power required - Completely portable - Wide range of uses (home, business, office, warehouse, garden, garage, shed, boat, caravan, shop, goods yard etc.) - Full instructions included Technical Specification: SENSOR MODULE: - Passive Infrared (PIR) motion detector - Transmitter: 433 MHz, range up to 400ft - Sensor Detection: 40 degree angle coverage at 30ft, mounted at 4ft high - Battery: 9V (not included) - Low battery indicator RECEIVER MODULE: - Range: up to 400ft from Sensor Module - Battery: 3C (not included) - Switch with 3 settings: Off/ Hi/ Low - Input connector for 6VDC Adapter (not included) - Low battery LED indictor