Controlling access to functionality within an installed software product. In a section perpendicular to an axis located on the first surface between the two side-end portions, the height of each of the light scatterers from the first surface gets smaller from the axis toward the side-end portion. The method can further include identifying the sound signal as a security event according to the comparing step. The control section starts 600 W drive of the lamp heater at time t1 after the control section detects user’s entry into a room, and the control section maintains the 600 W drive during an inrush current reduction period D2. The perspective or vantage point from which location data and other information is viewed may be selected or changed by the user of the unit.