What does A1 mean?

A1 is an Application Performance Class designed for microSD™ cards used in compatible devices that run or store applications. Rather than measuring video recording performance, the A1 rating assesses how well a card handles random reading and writing operations, which are important when launching or managing apps stored on supported devices. This makes A1 particularly useful for devices such as handheld gaming systems, smartphones and other compatible electronics.

Every TrailBit™ microSD™ card is validated to the A1 performance standard, providing dependable responsiveness when used in compatible application-based devices. While many customers purchase TrailBit™ for recording photos and video, the inclusion of the A1 rating means the card is also well suited to a wider range of everyday storage applications.