The Guardline Wireless Driveway Alarm motion detector has a passive infrared lens that activates when it senses both heat and motion. When the Guardline sensor is triggered by a person, car, or large animal, a signal is sent to the receiver in your home that will alert you with a melody. The sensor has a 40ft detection distance and an adjustable field of view of 9-12 degrees wide.
The Guardline Wireless Driveway Alarm runs of a radio signal, so there’s no wifi or monthly contracts required. Use your Guardline to detect who's on your property, when the mailman arrives, and more. Additionally, the system is waterproof and weather-resistant and designed to work throughout the seasons.
Here’s where you can find some more information.