Feature 1, This is a set of reverse system parts for vehicles to ensure drivers' backup parking safety. 2, Help to provide increased safety for passengers, pedestrians and family members who happen to be around the moving vehicle. 3, Provide 4 radar sensors, which is of high sensibility, to ensure your traffic security and personal safety. 4, With digital colored LED display (number & light). 5, Self-inspection system, can automatically check abnormal condition itself, avoiding reversing collision.Features: This is a set of reverse system parts for vehicles to ensure drivers' backup parking safety. Help to provide increased safety for passengers, pedestrians and family members who happen to be around the moving vehicle. Provide 4 radar sensors, which is of high sensibility, to ensure your traffic security and personal safety. With digital colored LED display (number & light). Self-inspection system, can automatically check abnormal condition itself, avoiding reversing collision. With a drill head, convenient to drill hole. Easy installation and operation. Specification: Material: Plastic Radar Color: Black, Red, White, Silver, Blue(Optional) Working Voltage: 12V DC Detecting Distance: 0.3 - 2.5m Voice Broadcast: English Package Weight: 376g/13.3oz Package list: 1 * Monitor 1 * Receiver 4 * Radar Sensors 1 * Hole Saw 1 * Power Cable Note: It is easy to install, but professional installation is highly recommended.