Komputerbay 2 PACK - 64GB SDXC Secure Digital Extended Capacity Speed Class 10 600X UHS-I Ultra High Speed Flash Memory Card 40MB/s Write 90MB/s Read 64 GB Only compatible with SDHC-labeled host devices (Not compatible with standard SD devices) Reliability with a Lifetime limited warranty, Huge 64GB capacity Great for HD video recording, High speed Class 10 rating, UHS I rated 90MB/s dramatically improves transfer speeds from card to computer Take data, photo, music, and video files wherever you go