Features: sensor system, double CPU and advanced chipset for enhanced coverage and detection (0-2.5m). Withdigital 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. Antifreeze 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 module working temperature: -30 - 80 celsius degree Display working temperature: -20 - 70 celsius degree LED display size: 9 * 1.5cm Display weight: 88g Main control box size: 10.5 * 6 * 2cm Main control box weight: 63g Package including:(without the retail box,tks for your well understanding!tks a lot!) 1 * Main Control Box 1 * LED Display Indicator 4 * Parking Sensors with 2.5M Line 1 * Hole Saw 1 * Power Cable 2 * Double Side Sticker