Product DescriptionExperience seamless monitoring of your driveway with the Mighty Mule Driveway Alarm (FM231). Utilizing advanced electromagnetic technology, this wireless system accurately detects vehicles entering and exiting your driveway. The indoor chime alerts you with a reliable signal, offering a range of up to 400 feet from the indoor receiver to the driveway sensor. Designed for efficiency, this alarm system avoids false alarms by specifically focusing on vehicles and not detecting people or animals. The transmitter operates on 2 "AA" batteries (not included), and for optimal performance in colder climates, it is recommended to use lithium alkaline AA batteries. Customize the sensitivity with a radius adjustment ranging from 3 to 12 feet, and personalize transmission codes using dip switches. Installation is a breeze, and the kit includes a stake for easy setup. Simply position the electromagnetic sensor strategically, allowing it to "learn" the area for accurate detection. Ensure proper functionality by installing the batteries near the installation site rather than in the home. Trust in Mighty Mule for a reliable and efficient driveway alarm system that has been designed with your security needs in mind.From the ManufacturerKeep track of vehicles entering or exiting your property with the Mighty Mule Driveway Alarm. (FM131) When a vehicle passes the sensor, the receiver emits an audible tone. Easy to Install and stake is included in kit. The electromagnetic sensor will sense large metal objects and send a signal to the interior base station to let you know someone is there. Install the batteries, near the installation site so the sensor can "learn" the area. If the batteries are installed in the home; the unit may not function properly.