Starting at 4GB, microSDHC card offers higher storage for more music, more videos, more pictures, more games more of everything you need in today's mobile world. The microSDHC card allows you to maximize today's revolutionary mobile devices. Kingston's microSDHC card uses 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.