Securedigital sd sdxc card memory size 64 gb read speed 45 mbs bus interface uhs i file format exfat operating voltage 2 7 3 6 v series integral ultimapro device class macbook dslr digital camera printer camcorder functions write protection switch manufacturers warranty 5 years sdhc class 10 uhs speed class u1 adapter without adapter dimensions 32mm x 24mm x 21mm weight 2 g