Securedigital sd sdxc card memory size 64 gb read speed 22 mbs write speed 16 mbs file format exfat operating voltage 27 36 v series transcend premium device class car radio macbook tv dslr digital camera camcorder computer printer functions write protection switch standard sd 20 sdhc class 10 adapter without adapter dimensions 32mm x 24mm x 21mm weight 2 g