SanDisk Extreme Plus 64GB UHS-I/ U3 Micro SDXC Memory Card Up To 80MB/s With Adapter- SDSDQX-064G-U46A (Older Version) Delivers 4K Ultra HD and Full HD video recording and playback Meets the new UHS Speed Class 1 (U1) specification Up to 80MB/s read speed and up to 50MB/s write speed Built for extreme conditions; temperature proof, water proof, shock proof, and x-ray proof.