About this item READY FOR TOMORROW- Ready for future superspeed products with PCIe-NVMe interfaces and performs at UHS-I speeds when used with microSD UHS-I and UHS-II devices.EXPONENTIALLY FASTER PERFORMANCE- Up to 4.4 times faster read speeds than our fastest microSD UHS-I cards with up to 880MB/s transfer speeds.MASSIVE TIME-SAVER- Transfer 60 minutes of 4K UHD video shot at 30 fps in just less than 70 seconds and 1,000 10MP RAW photos in less than a minute (51.7 seconds) when paired with SanDisk PRO-READER SD Express Dual Card (sold separately).DURABILITY YOU CAN COUNT ON- Cards are waterproof, temperature-proof, humidity-proof, drop-proof, shock-proof, magnetic-proof, x-ray proof, and wear-out proof.HEAT MANAGEMENT REIMAGINED- SanDisk ThermAdapt helps keep devices from overheating with a specially designed enclosure and controller that uses dynamic adaptive thermal management.