An oral appliance includes first and second mouthpiece elements each equipped with adjustable ribs on an anterior portion and ramp surfaces on each of its posterior arms. The solver can generate solution data these constraints. A CPU performs channel search processing when the timing of execution previously set has arrived, and performs processing for acquiring channel information included in the digital broadcasting wave and storing, when a new channel is found, for example, channel information related to the new channel in a non-volatile memory. The controller is operative for causing the power source to supply power to the heating module at least in part based on first information derived from a temperature of the water within the water receptacle and second information derived from a condition associated with the power source. , puts and calls, forwards, futures, swaps, or swaptions. Gear position of the model vehicle may be simulated on the basis of the virtual velocity, and engine sound data of a characteristic of the gear position may be generated.