Compact keyboards reduce the reach to the mouse & thereby also reduce stress on the forearms. Research has shown that about 90% of users never or only sometimes use the numerical part of the keyboard. The numerical part should ideally be optional & usable either on the left or right. Compact keyboards are experienced as more comfortable than standard keyboards. S-board 840 Design USB (Universal Serial Bus) (US lay-out) is compact keyboard with 2 USB (Universal Serial Bus) hubs.