Micro sd card micro sdhc card memory size 4 gb read speed 20 mbs file format fat32 operating voltage 27 36 v series integral ultimapro device class digital camera dslr camcorder mp3 player mobile phone tablet pc computer printer macbook functions write protection switch sdhc class 10 adapter sd card adapter operating temperature 0 to 60 c dimensions 15 mm x 11 mm x 1 mm weight 04 g