The professional car parking sensor consists of ultrasonic sensors， digital control box， and LED display. This system detectsthe distance between the car and back obstruction with ultrasonic sensors installed at the rear bumper of car. Main features: 1.100% Brand new and high quality.2.LED display size: 125mm x 14mm.Control size:105mm x 60mm x 22mm.3.Easy installation and operation.4.Anti-freeze and rain proof.5.Sensor system and advance chipset for enhanced coverage and detection.6.Sensor color: Black. Functions:1¡¢Numeral and color LED display2¡¢Alarm by three-step Bibi sound3¡¢Left and right obstacle indication4¡¢Numeral display from 2.0m to 0m Parameter£º voltage£º9DCV¡ª15DCVRated voltage: 12DCVPower cost: Max 0.5WRespond distance: 0.3m¡ª2.0mAlarm distance: 0m¡ª2.0mDisplay mode: Led displaySensor diameter: 22mmInstall mode: drillSensor angle: X¡¢Y¡¢60¡æwork temperature: -30¡æ---+80¡æAlarm type: Buzzer (Bi Bi¡­.)alarm volume: 65dBAlarm frequency: 1.6-2.0m£º0.5 HZ£¨slowness£©£»1.1-1.5m £º1 HZ£¨slowness£©£» 0.6-1.0m:3 HZ£¨commonly£©£» 0-0.4m £ºBI----- £»Package included: 1 x Control Box1 x LED Display Indicator4 x Parking Sensors with 2.5M Line1 x Hole Saw1 x Power Cable2 x Double Side Sticker.1 x User Manual