Features:Theparking system automatically recognizes and displays the distance tothe nearest obstacle, and the sensitivity of the sensor can be adjustedto prevent false alarms 4 sensor systemDouble CPU and advanced chipset for enhanced coverage and detection (0-2.5m).Help to prevent dangerous and costly collisions.Helpto provide increased safety for paengers, pedestrians and familymembers who happen to be around the moving vehicle. Detect smallchildren and low walls as well.Anti-freeze and rain proof. Easy to install. A saw drill head included.Specifications:Rate Voltage: 12V DCRate operating range: 10.5V - 16V DCRate current: 100mA - 300mADetecting distance: 0.3 - 2.0mControl moudle working temperature: -30 - 80 Celcius degreeUltrasonic frequency: 40KHzSize:As pictureWeight:About 358gPackage included:1 x Main Control Box4 x Parking Sensors with 2.5M Line1 x Buzzer Display1 x Hole Saw1 x Power Cable1 x User Manual