HP A2 U3 High Speed microSDXC 256GB 100MB/s Class 10, U3, V30, A2, UHS-I 4K UHD Shock Temperature Waterproof for Action Camera, Mobile, Drone, Tablet HP A2 microSD Card The HP mx350 microSD Flash Memory Cards are the perfect solution to expand on-board memory of mobile devices. The rating, with read speeds of up to 100MB/s guarantees that you can quickly store and share content between devices. U3 technology is ideal for HD photography and 4K Ultra HD video recording, allowing you to capture high quality content on your action camera, drone, or other mobile device. Specification Format_ microSDXC Rating_ Class 10, U3, V30, A2, UHS-I Storage Capacity*: 256GB Read Performance**: Up to 100MB/s, random read up to 4000 IOPS Durability_ Magnet Proof, Shock Proof, Temperature Proof, Waterproof Operating Temperature_ -25° to 85° C Storage Temperature_ -40° to 85° C Warranty_ 2-year Limited Warranty Note_ *For Flash Media Devices, 1 megabyte = 1 million bytes; 1 gigabyte = 1 billion bytes. Actual useable capacity may vary. Some of the listed capacity is used for formatting and other functions, and thus is not available for data storage. **Based on internal testing; performance may vary depending upon host device. Not all host devices can achieve minimum 100MB/s sequential write speeds. 1x = 150KB/sec.