It's designed for indoor use, the thickness is only 30mm. Single sides snap frame ultra thin light box which is different from common light box use snap-open frame, it’s much easier for graphic switch. You only need to lift the four sided of aluminum frame then you can switch the file very easily even without moving the light box from the wall. It can be powered by LED or fluorescent tube (T4 /T5) for your options make your graphics standout in high-traffic areas. With the LGP technology, it can distribute light from the edges to make sure there are no hot or cold spots or shadows. Movable hooks are for hanging.