Our A series Parking Sensors are the best in China. The quality of these products is better than the products from Germany, Taiwan etc. The Guarantee of A-series is 3 years more than the standard in European. The electric components are from Samsung, Philip, etc. The sensors sensitivity is 2-3 times better than other similar products. It can even detect 2mm steel wire. The detection error is <2mm. It is usually installed in luxurious cars such as BMW.