A1 Application Performance Class - able to run mobile apps directly from card with Android Marshmallow and later OS. (Requires SDXC host device. To get benefit of A1 performance; device must support Android Adoptable Storage Feature). V30 video speed class - supports 4K video recording UHS-I interface; U3 speed rated. Up to 100MB/s read speed and up to 80MB/s write speed Water resistant; shock proof and temperature proof.