Description:Wireless Parking Sensor，you needn't route the cableA small light(dot)indicates proper functioning of the system after being activatedDigital distance display of obstacleLED's(green，yellow and red)indicate different distances as well as orientation of the obstacleDifferent alert beeping intervals indicate different distances of the obstacle4 Round Recessed SensorsRate voltage:12vOperation voltage:10.5-16vRated current:40-300mADetecting distance:0.3-2.5mUltrasonic Frequency:40KHZWorking temperature:-40--80 degreeDisplay working temperature:0~+60 degree Package include:1 X Led display monitor(built-in receiver)1 X Contorl box(built-in trasmitter)4 X Parking sensor1 X 22mm drill1 X ManualSticker etc.