Extreme conditions call for Extreme products SanDisk Extreme CompactFlash is designed exclusively for the high-end, professional photographers who work under extreme conditions and expect the very best in products and support services. Advanced Features: A minimum of 9MB/sec sequential write speed, which allows for faster capturing of large image files to the card A minimum of 10MB/sec sequential read speed, which allows for faster viewing of images and transferring data to the card SanDisk Extreme CompactFlash cards are tested in extreme temperature ranges from -13 to +185 degrees Fahrenheit so that they can be used to shoot photos in any weather condition SanDisk Extreme CompactFlash cards are shock and vibration tested with industrial-grade RTV included, which is designed for rugged use Backed by a lifetime limited warranty, if thereâs ever a problem, SanDisk will replace it! In addition, these cards are packaged with a mini-CD for data recovery software, RescuePRO, to recover photos that are accidentally deleted. Lastly, these cards also include a travel case to help photographers keep their memory cards organized.