Micro sd card micro sdxc card memory size 64 gb read speed 40 mbs write speed 20 mbs bus interface uhs i file format exfat operating voltage 27 36 v series bestmedia platinum device class digital camera dslr camcorder mp3 player tablet pc mobile phone computer printer macbook sdhc class 10 uhs speed class u1 adapter sd card adapter dimensions 15 mm x 11 mm x 1 mm weight 04 g