The sign is AAA photoluminescent and this means that it will glow in the dark even if there is a lack of lighting. This can be particularly useful in a time of emergency. If people are not sure about the layout of a building, this sign will provide them with very useful guidance. It is especially helpful during a fire drill or an actual emergency. Fixing requires anything as simple as sticky pads, 'No-nails' type adhesive or double-sided tape.