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 How radar works: When you stop in front of you: - Press the brake and the front sensor starts to work - If there are no obstacles, the sensor will not work. When you are parking in reverse: - When you start to back up, the backing up sensor will start to work and the front sensor will start to work at the same time to avoid damaging the front. Package including: 1 * Main Control Box 1 * Buzzer display 4 * Rear parking Sensors with 2.5M Line 4 * Front parking Sensors with 6M Line 1 * Hole Saw 1 * Power Cable 2 * Double Side Sticker 1* User manuar