It's designed for indoor use, the thickness is only 38mm. Double sided snap frame ultra thin light box can show the pictures at the both sides of the light box. It use snap-open frame which is different from common light box, 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 (CCFL or T4) 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. Steel wire rope or movable hook are for your hanging.