ZCMYFA 512 MB Secure Digital Card (SD/512) (Retail Package) Built-in write-protect switch prevents accidental data loss Data transfer rate up to 2 Mbps (average) Average write speeds of 1.5 Mbps Low power consumption is easy on batteries Compatible with Windows XP, 2000, 98, 95, NT; Macintosh OS and OS/2 Warp