Kingston's standard Secure Digital (SD) memory cards combine massive storage capacity, blazing data transfer rates and ironclad security in a memory card no bigger than a postage stamp. With an excellent price-to-performance value, Kingston's SD cards are ideal expansion option for the smallest of devices including MP3 players, digital cameras, PDAs, smartphones and more. • For added reliability and durability, our solid-state SD memory cards are built of nonvolatile memory components and have no moving parts to wear out or break. • Join the many schools, consumers, businesses and government groups that use Kingston's standard Secure Digital cards when using SD-enabled devices. With the built-in write-protection switch to prevent accidental data loss, Kingston's legendary quality assurance and affordable price - you'll get peace of mind and the best price-to-performance value. Specifications: • Capacity: 4GB • Reading speed: 5 MB/S • Writing speed: 1.5 MB/S • Operating Voltage: 3.3v • Support Windows XP/2000/98/95/NT, Macintosh OS and OS/2 Warp Packing Information: • Package Weight: 0.6KG • 1 Package =10pcs