ACK-573W is especially designed for Windows, it has built-in trackball for mouse emulation, wireless input with built-in infrared technology, 89 keys keyboard with embedded numeric keypad and 12 dedicated function keys. 400 transmitter battery hours with typical usage LED indicator - Num Lock, Caps, Scroll Lock, Power LED and active LED 250mm per seconds tracking speed IBM AT, PS/2 and DOSV Compatibility Keyboard Interface 5VCD250mA Receiver max, connected to host computer Dimension - Length 13.3 x Width 6.8 x Height 1.3 inch Weight - 1.9 pounds
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