SanDisk Extreme III expands its award-winning, professional line of memory cards with a new 4GB SDHC (Secured Digital High Capacity) card. The SanDisk Extreme III 4GB SDHC memory card offers speed, performance and reliability to ensure you get your photos every time. A 4GB memory card can store more than 2,000 high-resolution pictures or up to 8 hours of MPEG 4 video*. As an added bonus, the card is packaged with a bonus SanDisk MicroMate so that users have a one-stop shop solution for capturing, storing and transferring their images. Fast 20MB/sec sequential Read/Write speeds Ideal for demanding photo shoots under severe weather conditions heat, cold, wind, rain, snow, etc Durable, reliable and thoroughly tested for heat, cold, shock and vibration Class 6 speed performance rating ( based on SD 2.0 specifications) RescuePRO data recovery software - ensures your photos will always be there What is SDHC? To support the higher capacity needs, SD cards are now requiring a different design. The new SD 2.0 specifications which supports 4GB and up, is called Secure Digital High Capacity (SDHC). The SD Association has created and defined 3 speed classes to help you identify speed and performance capabilities/minimum requirements of SDHC cards and their SDHC host products. Details on the SD 2.0 specification: http://www.sdcard.org or SanDisk.com/SDHC Cards address data (read and write) at numerous speeds. Many factors impede this performance. SDHC guarantees a minimum read and write speed necessary to handle recording high quality video and audio. The maximum card speed may vary, but you can always depend on SDHC cards to meet your SDHC host product's high quality performance requirements. SDHC Compatibility Information Because SDHC works differently (supports the new higher capacity cards) this new card format is not backwards compatible with legacy SD format host devices.