Welcome to my store，Please read the following terms carefully.Features:4 sensor system， double CPU and advanced chipset for enhanced coverage and detection.High sensitivity.With sound alert when the 4 cameras detect dangers.The closer the obstacles， the louder and faster the sound alert.Help to prevent dangerous and costly collisions.Help to provide increased safety for passengers， pedestrians and family members who happen to be around the moving vehicle.Detect small children and low walls as well.Anti-freeze and rain proof.Easy to install.A saw drill head included.Specifications:Operate voltage: DC 12V ±2VRate current: 200±50mADetecting distance: front：0.3～0.8m，back:0.3～2.0mDetective angle:H＞80°，V＞70°Working temperature: -20～+70℃Main control box size: 90x60x23mmMaterial: PVCColor:BlackMain control box weight: 51gOverall weight: 300 gPackage included:1 * Main Control Box1 * LED Display Indicator with 2M Line4 * Parking Sensors with 2.5M Line1 * Hole Saw1 * Power Cable2 * Double Side StickersPlease do not hesitate to contact us freely if any problem. Thanks!