The SD is one of the most popular types of flash memory cards in the world. The Secure Digital High Capacity (SDHC) card is the newest generation (Version 2.0). 4GB SD Secure Digital High Capacity (SDHC), 150X speed rating Class: 6 Capacity: available in 4GB Speed: READ at 20MB sec and WRITE at 13MB sec Supports Error Correcting Code (ECC) detect and correct errors Supports "In System Programming" (ISP) to load firmware Features: Original NAND Flash Chip Compatible with the new SD 2.0 standard Power down and sleep modes Supported Mechanical Write Protection Switch Warranty: Lifetime warranty through the manufacturer