Easy to use, plug-and-play operation with write protect switch.

SD: For use in most digital cameras, PDAs and in many other electronic devices. Low power consumption.

SDHC: High capacity SD memory card. As requirements for higher capacities come in, SD cards have grown in capacity. SDHC cards typically come in capacities between 4GB to 32G. Not backward compatible with standard SD devices, however standard SD memory cards can be used with SDHC devices.
Class 2 : >=2MB/s TV recording/DVD/standard DC.
Class 4 : >=4MB/s Mpeg2 (HDTV)/DC with continuous shooting option.
Class 6 : >=6MB/s Reflex DC and professional DC - on continuous shooting.

Micro SD: the Micro SD is the most commonly used memory card in mobile phones. Only 10% the size of a standard SD card. Micro SD adapter allows it to be used in standard SD card slots.

Micro SDHC: only 10% the size of a standard SD card. Compatible with all SDHC-labelled host devices. MicroSD adapter allows it to be used in standard SD card slots.