Sandisk Extreme MICROSDXC 64GB 90MB/S Flash Memory Card (SDSQXNE-064G-AN6MA) Write Speeds Up To 40mbps Transfer Speeds Up To 90mbps Microsdhc (16gb & 32gb) & Microsdxc (64gb) Form Factor Class 10 For Recording Full Hd Video (1080p) & Uhs Class 3 For Full Hd & 4k Ultra Hd Video Waterproof, Temperature proof, X-ray proof & Shockproof