8 Pin Dash Cam Cable, 24 Ft 2.5mm Male Rearview Backup Camera Reverse Car Recorder Cord Extension Cable for C450 3 Channel Dash Cam

8 Pin Dash Cam Cable, 24 Ft 2.5mm Male Rearview Backup Camera Reverse Car Recorder Cord Extension Cable for C450 3 Channel Dash Cam Situation 1: If your car do NOT have built in reverse system monitor display screen,need this dash cam reverse function,please connnect extension cable red wire to car reversing lamp posive terminal.When you reverse car,the display screen will switch to full screen of rear view. Siatuation 2: If your car already have reverse system display monitor,just need this dash cam record rear view when you are driving,just ingore the extension cable red wire,it no need connect to anywhere.When you drive forward or reverse car,the dash cam display screen will always show picture in picture of both front and rear view.