Micro SD is currently the smallest memory card available and is commonly used in mobile phones (including the BlackBerry 8320 Curve and Nokia N75), cameras, and GPS devices. They are about a quarter the size of a regular SD card. All of our Micro SD cards come with regular-SD adapters for using them in all devices that accept SD cards. All Micro SDHC devices take Micro SD cards but not all Micro SD devices take Micro SDHC cards, so make sure your camera/phone/etc. is compatible with SDHC if purchasing.