Integral Premium High Speed microSDHC and microSDXC cards are the perfect partner for your high-spec smartphone or tablet. Enjoy more space for photos, videos, music and apps. These superior cards offer super-fast read and write speeds and you can record high-definition video and take burst mode photos with confidence. Ideal for use in compatible smartphones, tablets, digital cameras, action cams, drones and game consoles Fast read and write ensures smooth video capture even when shooting at 4K and Full HD. No lag or dropped frames Ultra-fast read / write, with up to 100 MB/s* read and 50 MB/s* write (64GB) Ultra-fast read / write, with up to 100 MB/s* read and 50 MB/s* write (128GB) Ultra-fast read / write, with up to 100 MB/s* read and 50 MB/s* write (256GB) Ultra-fast read / write, with up to 100 MB/s* read and 50 MB/s* write (512GB) Features: Video Speed Class 30 (V30) A1 App Performance Specification - high IOPS ensures best performance in compatible smartphones and tablets UHS-I, U3 (Class 3) specification Complete with free protective case 5 year warranty *Based on internal testing; performance may vary depending on host device.