Product model: A41 Operating voltage: 12 volts, Installation position: rear Screen type: None, Sound type: BIBI sound, Sound switch: None, Switch function: None, Microphone wire length: 2 meters, Sensor wire length: 2.3 meters, Products include: sounder *1, sensor *4, controller *1, double-sided tape *2, power cord *1, drill *1, packaging *1, Single package size: 178*130*45MM Single weight: 300G/ set, Packing quantity: 50 sets/box, Carton size: 67*25*37.5CM(A50#)