HP Input/ Output devices provide additional desktop functionality for HP notebooks. The HP USB (Universal Serial Bus) & PS/2 Mouse is a two-button mouse with scroll wheel that provides the speed & accuracy of optical tracking in a simple, elegant design. It connects to standard USB (Universal Serial Bus) ports & also comes equipped with a USB (Universal Serial Bus) to PS/2 adapter that converts from a USB (Universal Serial Bus) Series connection to a PS/2 connection.