Wide Range of Uses - Motion detection is an essential part of any home security solution. The waterproof sensors in this system uses a Pyroelectric infrared (PIR) motion sensor to detect heat and movement so you can quickly be alerted to movement on your driveway, front porch, gate, shed, walkway, or even swimming pool (for when kids get too close). Great for homes, businesses and offices..Long Distance Wireless and Reliable Battery Life - Trigger 50 times a day,the sensor's battery can be used for a year. Communication range up to 500FT (150 Meters) from each sensor to the receiver. Cars, people, and animals can be detected within 24FT/8M of each sensor’s angled eye. Think of this system as your long-range doorbell..Easy to Install & DIY - This system is fully-expandable, with plug-and-play sensors that can be set up within minutes. Pair each receiver with up to 16 sensors for full coverage of your property. The sensors can be mounted to walls, fence posts, trees, or any other surface, providing extra layers of security and home safety..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. See Owners Instruction Manuel to swivel mount to refine the focus and detection angle of the sensor. 2 YEAR WARRANTY on parts and workmanship. 90-DAY RISK-FREE OFFER.eMacros ADVANTAGE-30 years+ driveway alarm wireless and motion alert system produced in our own factory with our leading-edge systems technology. Wireless Driveway Alarm Includes 1 Receiver and 2 Sensors.