The bead on the front of the NEF 10 gauge has been illuminated with Cableas lumimous paint. Works great...No battery needed, not impacted by cold temps light the othe light styks. Can illuminate with one of those Red Lens AA Might MAC lights held in a strap just to the side of your head. Now this is what you need when your hunting ont top of red rock mountain during those cold Feb winter hutns...