Features： 1、4 sensor system, double CPU and advanced chipset for enhanced coverage and detection (0-2.5m). 2、High sensitivity.With sound alert when the 4 cameras detect dangers. 3、The closer the obstacles, the louder and faster the sound alert. 4、Help to prevent dangerous and costly collisions. 5、Detect small children and low walls as well.Anti-freeze and rain proof. 6、High sensitivity. With sound alert when the 4 cameras detect dangers. 7、The closer the obstacles, the louder and faster the sound alert. Help to prevent dangerous and costly collisions. 8、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. 9、Anti-freeze and rain proof. A saw drill head included. Easy to install. Specification： Car Parking Reverse Backup Radar Sound Alert + 4 Sensors Quick Overview: Professional Car Parking Radar System for your beloved car. High quality. Easy installation and operation. Features: 4 sensor system, double CPU and advanced chipset for enhanced coverage and detection (0-2.5m). High sensitivity. With sound alert when the 4 cameras detect dangers. The closer the obstacles, the louder and faster the sound alert. 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. Specifications: Rate voltage: 12V DC Rate operating range: 10.5V - 16V DC Rate current: 100mA - 300mA Detecting distance: 0.3 - 2.0m Ultrasonic frequency: 40KHz Control moudle working temperature: -30 - 80 celcius degree Display working temperature: -20 - 70 celcius degree Indicator size: 44x17mm (D x H) Sensor size: 19x25 (H x D) Main control box size: 90x60x23cm Main control box weight: 63g Package List: 1 * Main Control Box 1 * Sound Alert Indicator 4 * Parking Sensors with 2.5M Line 1 * Hole Saw 1 * Power Cable 2 * Double Side Sticker 1 * User Manual Package List： 1 * Main Control Box 1 * Sound Alert Indicator 4 * Parking Sensors with 2.5M Line 1 * Hole Saw 1 * Power Cable 2 * Double Side Sticker 1 * User Manual