A keyboard having an input region that provides a set of input elements designed to complement a separate pointing device such as a computer mouse. Determination of the gravity center component includes the use of a tilting action in combination with the use of sensors to sense the movement of the parcels as they tilt. The bond is configured to surround the region for supporting the component. The bridge members disposed at the receptacle end. In heating mode, recycled air acquires heat from the heat pump’s condenser coil and transfers this heat to the on-demand hot water.