This Grey (Silver) X 4 Car Reversing Parking Sensors Kit Buzzer Audio Alarm Led Display enables you to control your parking. The sensors are universal for all transport applications! Control module working temperature: -30 - +70 Celsius degree Sensor size (H x D): 1.9 x 2.5 cm / 0.75 x 0.98 Inch LCD display size: 9.9 * 2 x 2.6 cm / 3.9 * 0.79 x 1.02 Inch Main control box size: 10.5 x 6 x 2.3 cm / 4.13 x 2.36 x 0.91 Inch The radar system turns on automatically when the car engine starts. Three colours green, yellow, red LED lights indicate obstacle distance. Beeping alarm prompt step by step, closer the obstacle, more rapid the alarm sound. Obstacle specific position distance shows on the LCD screen. 4 Grey sensors with 2.5 meters lead for the rear Specific figure for distance shows on the.