1.wireless transmission parking sensor 2.LCD display 3.easy to installtion . 4.bi bi voice. 5.4 parking sensor 1. wireless LCD display parking sensor with 4 sensors2.LCD display,place in the upper left panel.3.wireless transmission4.bi bi voice .5.manufacturer and good quality.6.packing detail: 0.6kg/set, 20sets/ctn N.W: 13kg, G.W:17kg wireless LCD parking system WRD-N058C4 parking sensor