Description Keep track of vehicles entering or exiting you property with our FM231 wireless driveway alarm system. The solar powered compatible system monitors and alerts you when someone enters your driveway, no matter the length or type of driveway. With a 400 ft range and an electromagnetic motion sensor that only detects vehicles, this driveway alert system is perfect for homes or businesses, allowing you to keep a pulse on who is coming in and out of your driveway. Increase the long-range wireless system with additional driveway vehicle sensors that can be programmed to automatically open your gate for exiting guest without using a remote. Wireless driveway vehicle sensors are available for ranges betweenPRODUCT DETAILS: Instantly alerts you when someone pulls into or out of your driveway The outdoor electromagnetic sensor only detects vehicles; no false alarms due to animals, children, etc. Easy-to-install Electromagnetic Sensor Wand is buried next to your driveway, and detects mass metal moving within a 3-12 ft. radius of the wand. When a vehicle passes by the sensor, an outdoor transmitter communicates wirelessly to an internal base station up to 400 ft. away and sounds a pleasant chime Ideal for home and business Requires 2 AA batteries (not included) Low battery indicator on both the Indoor receiver and transmitter