Professional Ultra SanDisk MicroSDXC 64GB (64 Gigabyte) Card for Microsoft Surface Windows RT Tablet is custom formatted and rated for high speed, lossless recording!. (XD UHS-I Class 10 Certified 30MB/sec+) Blazing fast Class 10 and UHS Speed class 1 for flawless video/video capture! Waterproof, x-ray proof, extreme temperature proof, and shockproof to 500Gs!* Share your content collections with friends, family and colleagues easily. Eco energy consumes less power than other cards for the latest high-performance smartphones, superphones, cameras, and HD media devices! *Water proof: Tested to withstand up to 72 hours in 1m salt or fresh water; IEC 529 IPX7; product must be clean and dry before use. Temp -13F to 185F (-25C to 85 C), airport X-Ray rated.