HOSMART ADVANTAGE-30 years+ outdoor driveway alarm wireless driveway alert system produced in our own factory with our leading edge systems technology. Wireless Driveway Alarm Includes 1 Base Receiver and 3 coffee Sensor powered by AA batteries. EASY TO INSTALL- Quick Start Guide has you operational in minutes. Can expandable up to 4 sensors and unlimited receivers for complete coverage of your perimeter. wireless driveway alarm Detects movement from humans, cars, and large animals.Over 4 fun & unique chimes to choose from. Match different chimes with different sensors around your property to differentiate where driveway alarm wireless motion is being detected. SUPER LONG RECEIVING RANGE - 1/2 mile (in ideal situations). Our range is double the 1/4 mile competitors claim under ideal conditions. We use newer technology components and excellent manufacturing techniques. Our system has been real world tested in settings with trees, buildings, walls, and vehicles. It easily achieves a 1500FT wireless range in most conditions. It is been tested through thick forestry, hail storms, gusty winds, heavy rains, scorching heat, and snow. EXCELLENT QUALITY - Outdoor driveway alert sensor system is made with industrial grade PVC housing, rubberized weather/water resistant seal, and a sunshade. Power on the sensor with 4pcs AA 1.5V AA batteries(not included in the package) and turn on the receiver with the cable or AA batteries. After the batteries are inserted, the power of the sensor can last for about one year, which is very durable. EXTREMELY RELIABLE - Much time went into developing and testing our reliable InfraRed outdoor driveway alarm wireless detector that will dependably alert you to activity around your property. False alarms are minimized by adjusting the sensitivity of the sensor-eye with Switch 1. (Hi = 30ft, Low = 15ft.) See Owners Instruction Manuel. Swivel mount to refine the focus and detection angle of the sensor.