The microSDHC card allows you to maximize todays revolutionary mobile devices. Kingstons microSDHC cards use the new speed class rating of Class 4 that guarantee a minimum data transfer rate of 4MB/sec. for optimum performance with devices that use microSDHC. Identical in physical size to todays standard microSD card, the microSDHC cards are designed to comply with SD Specification Version 2.00 and are only recognized by microSDHC host devices. They can be used as full-size SDHC cards when used with the included adapter. To ensure compatibility, look for the microSDHC or SDHC logo on host devices (e.g. phones, PDAs, and cameras). Wherever you find yourself in the mobile world, you can trust and rely on Kingstons microSDHC cards. All cards are 100-percent tested and are backed by a lifetime warranty and free live technical support.