In 1 set of products :you can also choose any color, such as: 8 sensor products, you can choose black 2, white 3, red 3......... When submitting an order, please remember to leave us a meage! You can also paint the sensor, and if so, I suggest you choose a white sensor, so that you can better change the color. Product features:1>This product adopts double digital display, obstacle distance before and after the automobileindependent display2>The product with four voices (voice / buzzer / mute / voice + buzzer), cro cutting exchange3>Display with 7 adjustable volume4>Can independently display the direction of 4obstacles5>Full-weather design, anti-wind, anti-sand, anti-fog, anti-frost, anti-ice, anti-snow, anti-rainsensor systems for enhanced coverage and detection.6>Sound alarm: Heart beat type, more recent alarm more rapidlyProduct parameters1>Digital LCD display (number & light). Help to provide increased safety for paengers,pedestrians and family members who happen to be around the moving vehicle2>Specifications:3>Rate voltage: 12V DC4>Rate operating range: 10.5V - 16V DC5>Rate current: 100mA - 300mA6>Ultrasonic frequency: 40KHz7>Control moudle working temperature: -30 - 80 celcius degree8>Display working temperature: -20 - 70 celcius degree9>Sensor diameter: 22mm10>Installation mode: Drilling How does the parkingsensor work? WhenReversing the sensor detects an obstacle, the monitor will start working, display the distance and alarm, and if the sensoris not detects an obstacle, the monitor will not work 1The distance behind the obstacle behind the car 2The distance between the two sensors in the middle of the vehicle detects the obstacle 3The distance to the right obstacle behind the car 4The distance behind the nearest obstacle 9Shade design, effective anti-sunshine 10Volume up button 11Sound switch button, you can switch four kinds of alarm sound: mute, buzz, voice, buzz + voice