A method of controlling a home network device by using a universal web application. The light-emitting units generate lights in a corresponding light-emitting interval to illuminate a part of the LCD panel corresponding to the light-emitting units. The contact image sensing module captures a fingerprint image. The high frequency component is of sufficient energy for cross correlation without detriment to the basis pattern. In accordance with these methods, the heat output of the electrical heater is adjusted during production operations to at least partially match an estimated mismatch between electrical power supply from and demand on the grid.