Tripp-Lite Premier Office Keyboard. Device interface: USB, Keyboard layout: QWERTY. Keyboard dimensions (WxDxH): 463.5 x 190.5 x 25.4 mm, Keyboard weight: 0.7074 kg. Certification: FCC, CE & RoHS. Minimum system requirements: CD-ROM USB, Compatible operating systems: Windows 95, 98, ME, NT 4.0, 2000 & XP Mac OS 9.X +