Features: 4 sensor system, double CPU and advanced chipset for enhanced coverage and detection (0-2m). With digital colored LED display (number light). 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. Specification: TypeCar parking radar MaterialPlastic Quantity1pcs ColorBlack Rate Voltage12V DC Rate Operating Range9V - 16V DC Rate Current20mA - 200mA Detecting Distance0-2.5m / 0-8.2ft Ultrasonic Frequency40KHz Control Box Working Temperature-30 - 80 celcius Display Working Temperature-20 - 70 celcius LED Display Size9*1.5cm / 3.5*0.6 Control Box Size9*6*2.2cm / 3.5*2.4*0.9 Display Weight0.088kg / 3.1oz Package: The product has two kinds of packages, one is display + host + sensor One is sensor 1*Main Control Box 1*LED Display Indicator 4*Parking Sensors with 2.5M/8.2ft Line 1*Hole Saw 1*A saw drill head 1*Power Cable 2*Double Side Sticker This product is no packaging Box, thank you!