It is intended to provide a milk drink obtained by starting with a milk protein-containing powder having a seriously worsened flavor which is free from worsening in the flavor after heating and sustains a flavor comparable to a product obtained by starting with fresh milk or fermented milk alone without using such a starting material as described above. An electromagnetic clutch is provided to selectively engage and disengage the two-way clutch, and includes an electromagnet having a core to which a flange is secured. In response to a user input selecting at least one or more regions of interest including one or more of the pre-identified anatomical landmarks, the user is automatically navigated to the selected region of interest. The invention is also capable of receiving and storing digital audio andor video information from other sources, so that the system can play both the digital audio andor video information digitized by it and that received from the other sources.