... Keyboard features: Dimension458x195x20mmKeycaps104 keycapsNet Weight592gWorking ModeMembrane switchWorking VoltDC+ -0.25vWorking Current100MAPortPS/2 OR USBSystem RequirementsWindows98,ME,2000,XP,2003,X64,IBM1> Laser ... requirementsWindows98,ME,2000,XP,VistaReceiverUSB 2.02.4G wireless optical mouse, change the DPI freely; Smooth moving and high positioning precision. Wireless keyboard & mouse combo