MicroSDHC card is the smallest memory card on the market is roughly 1/4 size of a standard SDHC cards. The card is intended primarily for use in mobile phones, but with the included adapter, but it can also be used in all common commercial devices that have an SDHC slot.
microSDHC: Capacity: 4GB/Class 4 Baud rate approx 4MB/s write, and up to 20MB/s read data Supplied with adapter for use in all devices that support SDHC standard size