LONG RANGE CONNECTION - Working range up to 328 feet (100 meters) between receiver and transmitter, allowing you to place it at a good distance from the receiver to alert you to the arrival or departure of family members, unwanted guests, solicitors, or visitors at your home or business. EASY, FAST, WIRE-FREE INSTALLATION - Infrared sensor detects motion and sends a signal to the receiver. Choose from 38 ringtones with bright LED light indication. Sensor is wall mountable. IDEAL FOR FRONT DOORS, WINDOW FRAMES, DRIVEWAYS, WALKING PATHS, AND OTHER AREAS - Perfect for monitoring entry points in your home. Also suitable for business owners working in the back or out of sight, providing notification when customers enter the store. Note: This device is not waterproof. Keep it away from rain or cover it adequately. WIRELESS PLUG-IN RECEIVER - Portable wireless receiver plugs into any standard outlet. The sensor operates on 3 AAA batteries (not included). Detection time delay between motion sensor alerts is configurable from 15 to 30 seconds. Place the sensor at your driveway entrance and the receiver inside your home. 2 SENSORS AND 1 RECEIVER - Receiver supports pairing with multiple sensors. Sensors can be installed on different floors or rooms to ensure alert chimes are heard throughout the property.