The Gekogear 4K Ultra HD Rearview Mirror Dash Cam with Backup Cam is a powerful and versatile solution for a comprehensive incar monitoring experience. With a wide 139degree field of view for the front and 142degree backup camera this dualcamera system captures the entire road and your vehicle’s surroundings with exceptional clarity. Experience peace of mind on the road with the integration of this dash cam features that includes back up reverse lines. The front camera records at 4K and rear camera record at 1080P Full HD resolution. This will smoothly capture clear video in fast moving scenes. With loop recording our this camera continuously captures footage overwriting the oldest files when storage reaches its limit. This sleek device seamlessly combines a modest form factor with a userfriendly display. The Gsensor is a gravity sensor that will sense any collision swerve or hard braking and automatically lock the current video so it cannot be loop recorded over. A 32GB micro SD card is included in the package so you ll be set to install in your car and start recording. This device supports up to 128GB of external storage .