The test area is mainly assembled from the house with the dimensions of 4 meters X 5 meters X 2.5 high (as shown in the attached photo, the building is constructed according to the customer's on-site drawings (as shown in the figure below). The test floor of the room is composed of pine boards. The top is made of a square ceiling decorative surface. Measurement of the room: the overall size of the room, (length X width X height) the lighting illuminance and color temperature inside the room. The interior simulated furniture is distributed and placed with food cabinets, tables, and chairs , sofas, open cabinets, floor lamps, power cords, obstacles, heater bases, carpets, grids, pressure lines and other actual test site simulation items.