If you are like me, as I get older, the birds seem to fly faster and are harder to catch. I usually go out and catch them in the dark, which makes it much easier to catch them. This cap really solves the problem of banding or handling in the dark. A quality 6 panel twill cap with an ultra-bright LED bulb that is water and impact resistant. The cap includes a convenient push on/off switch and two lithium cell 2032 batteries for hours of continuous use. One size fits most with adjustable Velcro® closure. I use mine frequently when I go fishing at night to remove the fish or bait the hook.