Specifications:Parking sensor technology: Ultrasonic Sensor 40KHzParking sensor position: Front and RearCompatible vehicle make: UniversalRated voltage: 12VOperation voltage range: 10.5-16VRated current: 40-300mADetecting distance: 0-2.5 metersWorking temperature: -40? to +80?Display working temperature: 0? to +60?Sensors: 4 front (6m cable length) and 4 rear (2.5m cable length)LED display size: about 9cm*3cm*2.5cm (5.5m cable length)Alarm: Buzzer, this parking radar is the newest design (The buzzer is always on, cannot be turned off, no switch)Wiring:Red wire to the ACC/ignitionYellow wire to reversing lamp positiveBlue wire to foot brake lamp positiveBlack wire to groundPackage Contents:8 x Ultrasonic sensors1 x Central control box1 x LED display buzzer alarm1 x Hole saw1 x User manual1 x Power wire set2 x Double-side adhesive tapes for control box and display screen