Securedigital sd sdhc card memory size 4 gb read speed 22 mbs write speed 18 mbs file format fat32 operating voltage 27 36 v device class car radio macbook tv dslr digital camera camcorder computer printer functions write protection switch manufacturers warranty 5 years standard sd 30 sdhc class 10 operating temperature 25 to 75 c dimensions 32mm x 24mm x 21mm weight 2 g