This hands-free magnifying headlamp is perfect 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 the 2.5X magnifier and headlamp are aligned to make tying knots much easier. The Firefly Magnifier & Light clips easily to your hat for handy flip-down access and makes for a great fly-fishing gift. The bright 3-bulb LED is water resistant and can be removed for daylight fishing. 2 x 3V 2016 lithium battery. Made in USA.