Features:4 sensor system double CPU and advanced chipset for enhanced coverage and detection (0-2.5m).With digital colored LED display 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. Rate voltage: 12V DCRate operating range: 10.5V - 16V DCRate current: 100mA - 300mADetecting distance: 0.3 - 2.0m Easy to install. A saw drill head included. Specifications: Ultrasonic frequency: 40KHzControl moudle working temperature: -30 - 80 celcius degreeDisplay working temperature: -20 - 70 celcius degree