Nextbase's microSDXC card is a U3 ultra-high-speed card that ensures video data is continuously written/overwritten with ease; allowing continuous recording in full HD at 1440p or 4K quality. With the microSD to SD adapter included in the package, you can easily view the files on your laptop or PC. U3 SD cards can withstand extreme temperatures (-20 to +45 degrees Celsius), SD cards without this standard can stop working at temperatures as low as 30 degrees Celsius. The continuous read and write speeds of Nextbase U3 SD cards are also significantly higher than conventional versions according to industrial standards. A continuous write speed of at least 48 MB/s is necessary - especially for 4K recordings. However, most conventional SD cards without U3 standard only achieve a continuous write speed of 40 MB/s, which is too low for use in high definition cameras.