The Guardline 500 ft range wireless driveway alarm is the perfect, easy to use, motion detector for your property. It runs on the included AC adapter and has a built-in battery backup and is easily placeable anywhere in your home. The compact receiver is simple to program and utilizes a loud chime and flashing LED lights when a sensor is tripped. The outdoor motion detector IR sensors come with protective coverings and an easy-mount bracket. Each set includes one sensor and one receiver (additional sensors and receivers can be purchased and added), offering you dual-zone coverage for your driveway, gate, home, or property. Features: - 4 “zones” allowing up to 12 sensors per zone. - Over 30 loud, high quality ringer options with adjustable volume control. - Receiver can be plugged in using included AC adaptor or can run on (4) AAA batteries. Driveway alert sensor runs on (4) AA batteries for up to 1 year. Low battery indicator included. - Wireless range between sensor and receiver up to 14 mile with normal interference, i.e. scattered trees, hills, parked vehicles, or building walls. Extra interference will diminish range. Sensor has up to a 40 ft motion detector range. - Flashing LED zone lights alert you at a glance in addition to the chime. - Weather resistant wireless motion detector with sun hood protects against sun, rain, and snow. - Allows you to easily differentiate between detection zones by chime as well as LED lights. For example, you can have your front yard set to zone 1 and your back yard set to zone 2. If motion is detected in your backyard, the zone 2 light and sound will go off. - Receiver includes a 12 volt relay to add wired external alarms, chimes, or bells. - 24/7 based tech support. Two year manufacturer's warranty.