Provided is a pressure detection unit in which a waterproof property can be improved. One of the mounting areas is provided with a bore through which a seat fastening screw is engaged. In the event of an incoming call to the mobile terminal, the virtual terminal receives the call in place of the mobile terminal and notifies the mobile terminal of the call. The knowledge interface engine is capable of obtaining information from the knowledge store and of providing a response to the at least one query to the unit.