... instruction:1. 4-channel video input for front,back,left and right view cameras,dual video output;2. ... per Picture 5,then if it switches to left(right)turning or reversing condition,the display ... 3,4,each controlling the view from Right,Left,Back and Front cameras accordingly.Please refer to the ... setting: Under reversing condition,even you turn on left or right turning light,the screen retains reversing ...