The product has 8 numbers, showing the detection distance of each sensor When the sensor detects an obstacle, the display will sound an alarm and display the distance of the obstacle to aist the driver in reversing safely and avoid danger The working principle of the sensor: 4 sensor productsthe sensors are installed in the rear of the car, and start when reversing. 6 sensor products:4 installed at the rear of the car and 2 installed at the front of the car. When reversing, turn on all sensors at the same time. The rear sensor is anti-collision and the front sensor is anti-wiping. When driving, brake and activate the two sensors in the front of the car. 8-sensor products:4 in the rear of the car and 4 in the front of the car. When reversing, six sensors are activated, four at the rear of the car and two at the front of the car. When driving, the brakes activate the four sensors at the front of the car. The display has four adjustable sounds, mute, buzzer, voice, buzzer + voice, when the obstacle is closer, the sound of the alarm will be faster. The alarm volume can be adjusted. There is a separate connector between the display and the control box, which makes installation and use easier and more convenient. We are very profeional and know how to make good sensors. We use dual-angle, large-core sensors to avoid false alarms and have a longer service life. Powerful function 1: There are 8 digits on the display, which respectively represent the distance and direction of the obstacle. 2: Four alarm sounds can be switched (mute, buzzer, human voice, voice + buzzer) 3: The size of the alarm sound can be adjusted. Features: 1Material Type:ABS 2Probe distance all digital display 3Smart start function 4The sensors car in front,detection range can be accurate to 0.3 ~ 1.2m. 5The sensors car in back, detection range can be accurate to 0.3 ~ 2.2m. 6When reversing the car, four probes behind the car are started. At the same time, the two probes on the left and right sides of the car will be activated, which effectively reduces the blind spot in the front left and right blind areas and prevents corner rubbing during reversing. 7The full-display reversing radar provides sound switching buttons. The user can use the display's switching button to mute, buzzer, Chinese/English voice (optional), or voice (optional)+beep sound patterns. Where you switch from one to the other. 8Full digital display reversing radar with 3 levels for volume control Wires Connection: Red--ACC White--Foot brake wire Yellow--Reversing wire 12V Black--Ground specifications: Rate voltage: 12V DC Rate operating range: 10.5V - 16V DC Rate current: 100mA - 300mA Ultrasonic frequency: 40KHz Control moudle working temperature: -30 - 80 Celsius degree Display working temperature: -20 - 70 Celsius degree Sensor diameter: 22mm Installation mode: Drilling Parking Sensor Sound: Heart beat type, more recent alarm more rapidly Size: 25CM*21CM*6.5CM