A video surveillance system includes at least one of a camera or a streamer. The light-transmitting pointer is mounted for rotational movement about an axis normal to the dial plate. The present invention achieves PDP multi-link and can process the transmission of PS domain data in parallel. The pressing member is configured to press the photosensitive drums toward the first sheet metal member. The plurality of synchronization circuits and the control circuit are operable to synchronize the switching frequencies of the variable frequency power converters to each other. The non-contact surface is provided with an oxygen permeance suppression layer made of a material having an oxygen permeability that is less than that of the contact surface.