Currently the smallest available form factor of memory card, the microSDHC memory cards are designed especially for smartphones. The memory card microSDXC requires very little power, thereby extending the battery life of your smart phones. Due to the small size of 11 x 15 millimeters, the microSDHC memory card is one of the smallest, physical, external storage medium. It can also be used for GPS devices, MP3 players, digital cameras and PDAs.