Wired USB-A connection delivers reliable plug-and-play performance without the need for batteries. Compatible with Windows, mac OS, and Chrome OS Full-size, six row, 104-key keyboard includes a numeric keypad Quiet clicking, for smooth, non-disruptive operation TAA-compliant, so its ready for use in U. S. Federal Government institutions and organizations A three-year warranty means you can rest assured knowing youre covered by Kensington.