Reversing Video Parking Sensors 4 Sensor Kit Four detectors(color selectable)Five different frequencies of alarm sound according to distanceNOTE: the monitor and camera are not included, if you need please feel free to contact us. This item can not working with AHD Camera and AHD Monitor!! With this Parking Sensor system installed, drivers can lower the risk of accident. This affordable parking sensor enhances the process of parallel and backup parking designed for your concerns about safety and for vehicles that have poor rear visibility. The system will work automatically to detect the obstacles at the rear of your car at any time. All parts are designed with professional grade quality. Specifications: Voltage: DC 9V-DC 15V Rated voltage: DC 12V Power cost: Max 1.5W Respond distance: 0.4m-2.0m Alarm distance: 0m-2.0m Sensor diameter: 22mm Install mode: drill Sensor angle: X, Y, 60c Work temperature: -30c-80c Alarm volume: 65dB