Designed with the Application Performance Class 1 (A1) rating, the 400GB Ultra UHS-I microSDXC Memory Card from SanDisk has been optimized to give Android users an improved mobile experience, delivering faster mobile app performance. The A1 spec allows the card to manage random read input-output access per second (IOPS) operations so it can quickly open apps and process accompanying tasks, such as audio, graphics, saved profiles, and in-app permissions.

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