The Nextbase 64GB U3 micro SD card and adapter is the perfect partner for all Nextbase Dash Cams. It is required for the Dash Cam to record the road ahead in full HD, 1440p, or 4K quality and is required for use with Nextbase Rear Camera Modules. With a capacity of 64GB, it will record approximately 8 hours of footage before the Dash Cam overwrites previous recordings, and up to 4 hours when using a Rear Camera Module.