1. four, six or eight sensors are available
2. VFD display, indicate the obstacle distance
3. the system will automatically start up when reversed
4. insert ultrasonic sensor
5. english voice speaker alarm at different distance
6. use USA CPU
7. any color sensor is available and suitable for any car
8. the closer the obstacle, the faster the alert keep frequency on indicating the safety zone, caution zone, danger zone

China Wholesale Electronics