Secure Digital Card Reader. Supports SD and MicroSD cards. High-speed Data Transfer Rate. Reads and Writes Data. Transfer Files Cellular phone, Digital Camera, Pda or Computer. Powers Via USB port. No additional power supply needed. Compatible with Windows Me/2000/xp Vista & Mac Osx V10.1.2 Plus. Fast transfer rate for relialable copy/ download/backup. Transfer files between your mobile phone, digital camera or PDA and a computer.