1.There is not any wire between the LCD monitor and Main box & camera(the camera connect to main box), it uses 2.4G frequency to transmit  the signal. It is wireless,and very easy to install
2.Measure the distance by radar, and show on the 7" TFT LCD Monitor(Wireless),the detected distance is 0.4--    2.0m
3.Display the optical videos by a cemera equipped at car rear bumper
4.You can tell the obstacle at right or left  and which sensor is nearest to obstacle easily from TFT LCD Monitor
5.With night version camera so that you can see the obstacle even in the night
6.Alarm by BIBI sound
7.All kinds of sensor colors and styles are available
8.High quality and easy to install.