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 rainproof. Easy to install. A saw drill head included. Specification: Type: Car parking radar Material: Plastic Quantity: 1pcs Color: Black Rate Voltage: 12V DC Rate Operating Range: 9V - 16V DC Rate Current: 20mA - 200mA Detecting Distance: 0.2-1.5m Ultrasonic Frequency: 40KHz Control Box Working Temperature: -30 - 80 celcius Display Working Temperature: -20 - 70 celcius Sensor Diameter: 22mm LED Display Size: 9*1.5cm / 3.5*0.6" Control Box Size: 9 * 6 * 2.2cm / 3.5 * 2.4 * 0.9" Display Weight: 0.088kg / 3.1oz FAQ: 1. No obstacle, have BIBI sound Answer: Red connect to turn lights, black connect the whole car lights, do not connect the negative. 2. No obstacle，display other number (1) The display shows different numbers, such as E03-E07, Answer：because the Electric current is not stable, buy a regulator specifically connected to the lights, do not shunt with the other (2) display same number Answer： Sensors should have 50 cm high, with the universal meter amount，sensors should be level, otherwise it will detect the ground.