Parking sensor 1) measuring the distance by radar 2) lesser package. One carton can be load 40pcs.Save the freight cost. 3) alarm by three step bi-bi sound 4) 2 and 4 sensors are available , 5) full-weather design, un-affected by wind, ice, snow & rain 6) all kinds of sensor colors and styles are available 7) high quality and easy to install 8)there are two model can be provided: Sb336-4 with 4 sensors Sb336-2 with 2 sensors Technical parameters: 1). Rated voltage: 12v dc 2). Operating range: 10.5ví½ 16v dc 3). Rated current: 50maí½ 120ma 4). Detecting distance: 0.4í½ 1.5m 5). Ultrasonic frequency: 40khz 6). Display working temperature: -30 í½ +70íµ 1) carton size: 460mmx310mmx510mm 2) quantity: 40 pcs/ ctn 3) g.W.: 20 kg 4) n.W.: 19.2 kg