The delkin 32gb 660x microsd memory card utilizes todays most advanced chip design to deliver a storage solution that excels in an action cameras most demanding video modes the uhs i speed class 3 rating guarantees a minimum sustained write speed of 30mbs providing transfer speeds that support frame rates surpassing 120fps in full hd video with write speeds surpassing 50mbs and read speeds up to 99mbs the 660x microsd card also excels in high resolution time lapse photography hdr high