SDSQXFN-256G-GN4NN,SanDisk microSD Express,880/650MB/s,A1,U3,UHS-I,RPD2,W/JC,4x6 Box,Global Capacity : 256 GB Speed performance1 : Up to 880MB/s read speed; up to 650MB/s write speed; 210MB/s sustained write speed. Interface : PCIe NVMe Dimensions PRODUCT (H x W x L) : 1.50 cm x 1.09 cm x 0.08 cm Weight (Product) : 1.2g Compatibility : Compatible with devices that include a microSDXCTM slot, including AndroidTM smartphones and tablets, action cams, drones, handheld gaming devices, and laptops. Warranty : Lifetime Limited Warranty