Fully tested, USB, Apple Pro Mouse in clear acrylic over black. This is a one button, optical mouse. Though possibly the most beautiful mouse Apple have ever created, this black model suffered from a design flaw which makes working units quite rare. The cable shielding bunches up where the cable entered the mouse and shorts out the USB connection. With this in mind, warranty is limited to 3m and care should be taken not to strain or twist the cable when using this mouse.