ChainStar Ultrasonic Parking Sensor (UPS) system is sophisticated anti-collision driving aid device combining ultrasonic technology and microprocessor. By means of different audible signals or/and visual readout, the system can alert you of obstacle distance behind or in front of your vehicle when in parking or reversing. ChainStar UPS is all-weather working system, it overcomes the disadvantage of other sensing systems which may be affected by some environmental factors. The great advantage is its endurance and reliability in adverse weather conditions like darkness, bright sunlight, heavy snow or raining, etc.