?Wireless CPU to display communications, easy to install ?Color LCD shows obstacle distance ?Alarm by Bi-Bi sound ?The simulative vehicle is displayed on the color screen ?All kinds of sensor colors and styles are available ?Four sensors for rear bumper ?Technical parameters: o Rated voltage: 12V DC o Operating range: 10.5V~16V DC o Rated current: 50mA~ 180mA o Detecting distance: 0.2~ 2.0m o Ultrasonic frequency: 40KHz o Working temperature: -30~+70deg. C o Wireless frequency: 443MHz