4 Sensor Parking Assistance System with LED Display - WHITE This simple and functional parking assistance system is activated when reverse gear is engaged. Ultrasonic sensors measure the distance to an obstacle, and a chime integrated into the LED display warns the driver by sending an acoustic signal (the frequency of the beep indicates the distance). MTECH parking sensors are characterized by a very low failure rate and easy installation. Sensors can be varnished without affecting their performance. The kit includes: - 4 WHITE sensors - LED display - Control unit - Wiring - Circular saw - Mounting elements - User manual in English Specification: Sensor diameter: 18 mm Voltage: 12V DC Power input: <4W Sensor Ultrasonic frequency: 40 KHz Distance covered: 3.0 m to 0.3 m Measurement error: +/- 5cm. Working temperature: -30C to +70C