The Professional High Speed Series Secure Digital cards provide the highest guaranteed sustained write speed and transfer rate for the professional shooter who needs immediate confirmation of image capture, or wants to identify accurate exposure, levels, or bracketing range. This Professional Series Secure Digital card is for the professional photographers who work under extreme conditions and expect the very best in products and support services. who needs immediate confirmation of image capture,also allows for faster capturing of large image files to the card, faster viewing of images and faster data transfer rates. Key Features Cutting Edge Technology Features ESP Technology (Enhanced Super-Parallel Processing Technology), which provides best-in-class performance. Reliable Tested in extreme temperature ranges from -13 to +185° Fahrenheit so that they can be used to shoot photos in any weather condition. Durable Shock and vibration tested with industrial-grade RTV included, which is designed for rugged use.