Driveway SensorsNeed to be notified when someone pulls in your yard? Single beam driveway sensorBudget friendly driveway alarmBattery recharges through a small solar panelWhen a vehicle passes through the beam, it trips the sensor and a chime will go off in your home!Sensors start at 149.95. Installation cost extra. Triple beam driveway sensorHas 2 antennas and 3 beamsRecharges through the solar panels located on the antenneaChime will be sent to the house when all 3 beams are blocked. These sensors are the best option if you have alot of animal traffic, or large dogs!Sensors start at 349.95. Installation cost extra.