Despite package information to the contrary, this keypad is essentially useless on a Mac. The numlock settings get lost at boot time, and the keypad only works with numlock in one particular setting. Also, the keypad seems to interfere with dashboard, slowing it down very badly and interfering with the function of things like the calculator (which you'd expect to use it for). In dashboard, the keypad does nothing at all in either numlock mode. Pass this one up.-JRS