The Car Parking Sensor System helps you be safe while parking by avoiding bumping into other cars and objects you can"t see. it detects the distance between the vehicle and rear obstructions. The distance is then converted in to both a visual and audible 3-stage alarm that helps the driver to safely avoid any accidents. Easy to install on your own, this sensor includes a smart control Box, exact-size drill bit, sensors and wires to control Box, DC power for display, fastening kit, digital display, and speaker. Technical Specification: 1) OEM Car Rear 4 Parking Sensor System 2) Sensor detection range: 5cm~2.5m 3) Display range: 30cm~2.5m 4) Advanced self-diagnosis with error indication 5) Improved anti-interference function 6) All weather design 7) 4xR7P SmartSensor module built in sensor, 22mm rubber angled, fit for spare tyre or tow bar use 8) 4/3/2 sensor optional 9) DSP01 display, 3 color LED 4 channel w/ digital readout 10) Power Input: 9.6~35V DC 11) mainly uses on the upscale passenger vehicle and all-terrain vehicle Packing: weight:0.7KG Box:26.5x19x6CM Accessory: Power Supply Cable 1PCS Sensor Cables 4PCS Display Cable 1PCS Buzzer Cable 1PCS 3M Self-Adhesive Tape or Velcro 1PCS High Quality Driller 1PCS lnstallation Manual 1PCS Sensor Spacers 4PCS