You should use this sign in all areas that should only be accessed by people that are approved. Failure to display this sign will mean that anyone will presume that they have permission to access a certain area. You will need this sign to inform them otherwise. The sign will even glow in the dark as it is Jalite AAA photoluminescent. Fixing requires anything as simple as sticky pads, 'No-nails' type adhesive or double-sided tape.