Functions: Electromagnetic parking sensor detects obstacles behind the car according to the reflection principle of electromagnetic wave, the system comprises of an electronic box, an antenna sensor and a buzzer or display Features: 1) Detection in all directions without dead angle 2) LED 3 colors (Green, Yellow, Red) displays to indicate the distance of obstacles. 3) Totally built-in installation with no bad effect to the car appearance 4) The sensor antenna is installed inside the bumper, no need for drill on the bumper 5) During approaching to an obstacle, the electronic unit activates the acoustic signaling with 3 types of signals - A continuous sound of "beep" approximately between 0-0.3m --LED lighting with red color. - A short interval sound of "beep" approximately between 0.3-0.5m--LED lighting in yellow color. - Al long interval sound of "beep" approximately between 0.5-0.7m--LED lighting in green color. Technical characteristics: Working voltage: DC12V +/- 2V Currency consumption: <50mA Working temperature: -20~+70癈 Detection range: approximately in 0.7m