Official Asus Zenbook UX31/21 Taichi21/31 USB 3.0 Fast Ethernet Adapter Full size RJ45 connector; LED on connector to indicate connection status Giga bit speed when running on USB 3.0 environment 100M/10M adapt when running on USB 2.0 environment Supported operating systems: Microsoft Windows 7 (32bit & 64bit), Microsoft Windows 8 (32bit & 64bit), Microsoft Windows 8.1 (32bit & 64bit) Compatible with ASUS Taichi21, Taichi31, TX201LA, U38N, UX21A, UX21E, UX31A, UX31E, UX32A, and UX32VD