This wireless driveway alarm can expand up to 4 sensors and unlimited receivers for complete coverage of the perimeter of your location - detecting movement from humans, cars, and large animals. As this driveway extension is made with industrial grade PVC housing, rubberized weather/ water resistant seal and a sunshade, it has been tested and can withstand thick forestry, hail storms, gusty winds, heavy rains, scorching heat and snow. It also easily achieves a 1500 ft. wireless range in most conditions.