Features: 1) Using Double CPU digital fill image sensor designed for automotive Rear View development design, using digital fill and software technology, clear image and distance on the monitor. 2) -30 to +60 temperature range of application, The factory after the high pressure water immersion test and 12 hours on the electrical aging test, multilayer waterproof design, truly high pressure washing and immersion . 3) The Sensors Installed in the Rear bumper of the car and included a Drill . Detect small objects and bars. 4) 6m Video cable connected with any TFT-LCD screen , power cable connection car Reversing power supply, Reversing, the monitoring Parking system automatically start working, you can clearly see the car Rear the distance and Image. 5) Tips : this link not included TFT Monitor and Rear View Camera; not support AHD camera. Specifications: 1. Rate Voltage: DC 12V 2. Operating Voltage Range: 9~16V 3. Rate Current: 20~200mA 4. Detecting distance: 0.3 - 2m 5. Ultrasonic Frequency: 40KHz 6. Step-up buzzer alarm Working principle : 1: Camera 2: Reversing radar 3: Car display When reversing, the camera and sensor, these two signals are input to the control box, and after the control box is processed, it is finally displayed on the display to assist the driver through pictures, sounds, and numbers. NOTE:This link not included car monitor and rear view camera. **If only connect parking sensor with DVD player or monitor, you only hear warning BIBI sound. So if you don't have rearview camera , we highly suggest you buy parking sensor and rear view camera from us . Alarm horn with adjustable volume 1: mute 2: mid-range 3: treble