The Wireless Mini Trackball Keyboard is especially designed for Windows, it has built-in trackball for mouse emulation, 88/89 keys keyboard with embedded numeric keypad and 12 dedicated function keys, and Fully function of 104/105 keys. Features: * Designed for Windows * Built-in trackball for mouse emulation * 88/89 keys keyboard with embedded numeric keypad and 12 dedicated function keys * Fully function of 104/105 keys Trackball: * Resolution: 200 DPI (X, Y Axis) * Signal output: Shift Sin wave (X, Y Axis) * Phase shift: 90 + 45 degrees * Tracking speed: 250mm/sec Specification: * Compatibility: IBM AT, PS/2, DOSV * Key layout: 88/89 keys * Operating temperature: 0 to 40 degrees Celsius * Storage temperature: -10 to 60 degrees Celsius * Operating humidity: 10% to 85% RH * Switch life: 5 million life cycles * Dimension : 13.3"(L) x 6.8"(W) x 1.3"(H) * Weight: 1.9 lbs