"Features: Support MS/Ms Duo /MS Pro Duo ,M2 Support MS parallel Mode (4bits) Specification: Compliant with usb 2.0 Plug and play Support M2/MS /MS Duo /MS pro Duo LED indicate working status OS support:Windows&Mac Driverless for Windows&Max Driverless for Win 2000/ME/2003/XP/, Mac 9.X or above Parking content:USB single card reader"