With 6 rows of keys including a numeric keypad, the layout is ideal for the touch typist looking for comfort and responsiveness; Full-size 104-key layout Provides direct and reliable connection for continuous performance and eliminates the need for batteries Built to last, this could be the last keyboard you ever have to buy and we?ll replace or fix it if something goes wrong Can safely stand up to immersion or frequent use of spray cleaners (USB connector cannot get wet) Wired, reliable USB connectivity without the need for batteries; Compatible with Windows 10, 8.1, 8, 7 and Mac OS X 10.6 and later