Retractable USB Connector , High-Speed USB 2.0 certified, backward compatible with USB 1.1, LED indicates data transferring status, System support: Windows 98/98SE/2000/ME/XP/Vista, Mac OS 8.6 and Linux kernel 2.4.0 or above(drivers required for Windows 98/98SE), Read up to: 10MB/sec ; Write up to: 3MB/sec.* (Speed may vary due to hardware, software and usage.)