 Like the "hockey-puck" mouse and all future mice Apple would make, the Apple Pro Mouse was a USB mouse with a much shorter cord than its ADB predecessors, its 2-foot cord was designed to plug neatly into one of the two ports of the Apple Pro Keyboard's built-in USB hub.The Apple Pro Mouse also featured a unique mechanism to allow for three click force settings for the required pressure to click the mouse.The Apple Pro Mouse was originally released on the iMac G3 "Snow."