The Mighty Mule wireless driveway alarm provides constant 24/7 driveway monitoring for your home, property or workplace. Electromagnetic sensor detects vehicles entering and exiting driveway and alerts you with an indoor chime. Delivers up to 400-ft. range from indoor receiver to driveway sensor/transmitter. Also ideal for monitoring parked boats, RVs, motorcycles and ATVs. Application: Driveway alert, Battery Included: No, Battery Type: (2) AA (transmitter), Detections Motion (ft.): 3-12, Power Supply: (2) AA batteries (transmitter)/AC (receiver), Range (ft.): Up to 400, Kit Includes: Stake, wand sensor, transmitter, receiver w/transformer, Material: Durable, synthetic housing on receiver, transmitter, and weatherproof coated metal rod for metal detectioin.