A system for displaying promotions on a viewing device associated with a network device. Let us consider a primary container and a secondary container from the plurality of containers, wherein the primary container is positioned above the secondary container. The control signals are copies of the gain signals. One transmission mechanism connects the movable lens barrel and the flash emitting unit with the motor, and responds to motion of the motor in a predetermined direction, to move the movable lens barrel to a photographing position and to move the flash emitting unit to the flashing position. The test is not dependent on the pattern rate of the tester.