Micro sd card micro sdhc card memory size 4 gb read speed 20 mbs write speed 12 mbs file format fat32 operating voltage 27 36 v device class digital camera dslr camcorder mp3 player tablet pc mobile phone computer printer macbook functions write protection switch sdhc class 10 adapter sd card adapter dimensions 15 mm x 11 mm x 1 mm weight 04 g