1.Audio alarm car radar 2.4 sensors 3.Digital distance LED display 4.Obstacle orientation ... the size of the driller for camera and the sensors.When install the system, the car should be in ... and bush; very hot, cold or moist weather, the sensors is covered by snow, ice mud, etc.Other ultrasonic ... it works well before using.This system is a reversing aid and the manufacturer takes no responsibility for any ...