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 4 obstacles5>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 rapidly<br> Product List:<br> 1: Monitor *1<br> 2: Control box *1<br> 3: Sensor *4<br> 4: Hole saw *1<br> 5: Manual *1<br> 6: Sticker X1<br> 7: Power cord X1<br> How does the parking sensor work?<br> When Reversing the sensor detects an obstacle, the monitor will start working, display the distance and alarm, and if the sensor is not detects an obstacle, the monitor will not work<br> Product 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: 21.3mm10>Installation mode: Drilling<br> 1The distance behind the obstacle behind the car<br> 2The distance between the two sensors in the middle of the vehicle detects the obstacle<br> 3The distance to the right obstacle behind the car<br> 4The distance behind the nearest obstacle<br> AVolume up button<br> BSound switch button, you can switch four kinds of alarm sound: mute, buzz, voice, buzz + voice<br> CVolume down button<br> Display size9.5*6*3.5 (cm)<br> The sensor uses a flat double-angle design, which features: high sensitivity, stability, waterproof, dustproof, beautiful, anti-false alarm