Patriot Signature Line (SL) Secure Digital High Capacity Flash Memory cards are based on SDA 2.0 specification, a completely new design that is required for cards and hosts to support 4GB and higher capacities. These cards adhere to SD Speed Class Rating specification which defines a minimum sustained transfer speed for SDHC cards. Patriot SDHC cards provide the ultimate flexibility and storage expansion for the latest SDHC compatible digital devices such as digital cameras, PDAs and mp3 players.