The Digi Chip 64GB Micro-SD memory card is a high speed Class 10 memory card. It's fully compatible with the latest Oppo phones and has App speed A2 specifications meaning that it has been optimised for efficient app performance. It's also UHS-1 U3 so that it can save high speed video in up to 4K quality. All Digi Chip memory cards come with a lifetime warranty for peace of mind.