This invention has as its object to be able to maintain constant audio data transmission intervals even when video and audio data are transmitted to many users. The optical film may comprise a matte layer disposed on a major surface of the color shifting film and the light control micro structured layer disposed on the color shifting film at an interface that is free of adhesive. Inner rings of the bearings are wider than the outer rings, and the inner rings contact one another. This results in the formation of very reactive superoxide radical ions andor the generation of hydroxyl radicals, either of which can oxidize targeted organic matter and pollutants in wastewater when the exposed area is submerged during rotation of the plate, thus purifying the water. Also disclosed are various methods of reducing power and retaining state using, for example, the state retention flip-flops and buffers. for a soaking period of 1-3 hours under air environment in a muffle furnace to obtain the radiopac material.