The Nextbase MicroSDXC card is a U3 Ultra High Speed card, this ensures that the video data is written smoothly and allows the dash cam to capture the road ahead in full HD, 1440p or 4K quality. Included in the pack, the microSD to SD adapter allows you to easily read the files on your PC or laptop. With a capacity of 64GB the MicroSD card will record approximately 8 hours of HD footage before the Dash Cam overwrites the oldest recordings, or 4 hours if using a rear camera module. This provides you with enough capacity to capture any incident and ensure you have the evidence you need. Up to 100 MB/s read speed Up to 70 MB/s write speed.