Micro sd card micro sdxc card memory size 64 gb read speed 40 mbs write speed 10 mbs bus interface uhs i file formats fat32 exfat operating voltage 27 36 v device class digital camera dslr camcorder mp3 player tablet pc mobile phone computer printer macbook functions write protection switch standard sd 301 sdhc class 10 uhs speed class u1 adapter sd card adapter operating temperature 0 to 60 c dimensions 15 mm x 11 mm x 1 mm weight