Feature: 1. LCD digital display with BiBi sound reminder. 2. 4 sensor system, double CPU and advanced chipset to enhanced coverage and detection. 3. Be beneficial to prevent dangerous and costly collisions. 4. Help to provide increased safety for passengers, pedestrians and family members who happen to be around the moving vehicle. 5. Detect small children and low walls as well. 6. Anti-freeze and rain proof. 7. Easy installation and operation. 8. With a drill head, convenient to drill hole. Specification: Sensor color:black Material: ABS Sensor color: White Rate voltage: DC12V Operation voltage range: 9-16V Rate current: 20mA-200mA Detecting distance: 0-2.5m Ultrasonic frequency: 40KHz Control moudle working temperature: -30 - +70 celcius degree Display working temperature: -20 - +60 celcius degree Package size: 16 * 12.6 * 5.5cm Package weight: 400g . Package List: 1 * Main Control Box 1 * LCD Display Indicator 4 * Sensors 1 * Hole Saw 1 * Power Cable 2 * Double Side Sticker 1 * User Manual