This sign may be very useful to inform a person of how they can open an emergency exit, for example. The sign also has the clear written words below. With this sign, you need not be concerned about it not working if there are no lights within the area, this is because it is Jalite AAA photoluminescent and it will glow in the dark. Fixing requires anything as simple as sticky pads, 'No-nails' type adhesive or double-sided tape.