The Nextbase 32GB U3 microSD card and microSD adapter is the perfect for all Nextbase Dash Cams and the U3 speed is required when using Dash Cams with Rear View Camera modules attached 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 adaptor allows you to easily read the files on your PC or laptop. With a capacity of 32GB the microSD card will record approximately 4hrs of HD footage before the Dash Cam overwrites the oldest recordings or 2 hours if using a rear camera module. This provides you with enough capacity to capture any incident and ensures you have the evidence you need.