For those times when you're trying to tie on a #24 trico or a #18 BWO in low light with trout rising around you. The Firefly is engineered so magnifier and headlamp are aligned to make tying knots much easier. The Firefly clips easily to your hat for handy flip-down access. This is a perfect fly fishing gift for any angler. The bright LED is water resistant and can be removed for daylight fishing.