... VoltDC+ -0.25vWorking Current100MAPortPS/2 OR USBSystem RequirementsWindows98,ME,2000,XP,2003,X64,IBM1> Laser key cap,the words are ... quality silicone materials, the flexibility feel is excellent with quick responsiveness. 4> Made with special materials and durable for usage. 5 ... .7 batterySystem requirementsWindows98,ME,2000,XP,2003,X64,IBMReceiverUSB 2.0 Wireless Keyboard & mouse combo