Micro sd card micro sdhc card memory size 8 gb read speed 11 mbs write speed 4 mbs file format fat32 operating voltage 27 36 v device class mobile phone tablet pc computer dslr digital camera camcorder printer macbook sdhc class 4 adapter sd card adapter operating temperature 25 to 55 c dimensions 15 mm x 11 mm x 1 mm weight 04 g