Micro sd card micro sdxc card memory size 64 gb read speed 90 mbs write speed 45 mbs bus interface uhs i file format exfat operating voltage 2 7 3 6 v series integral ultimapro x suitable for 4k recording full hd recording 360 recording 3d recording sports photography device class tablet pc mobile phone computer dslr digital camera camcorder printer macbook manufacturers warranty 5 years standard sd 301 sdhc class 10 uhs speed class u3