These driveway alarming systems are what everyone has been waiting for! They are wireless and predominately runs on solar power. No cabling is required and there is no maintenance. Select the driveway alarm that suits your requirements, choose from solar beams that work up to 1km, 800m or 500m clear line of sight from the driveway alarm chimes. Hills, bends in the road, building and trees will reduce the transmitting distance.