This is versatility at its best. The Fenix HL50 LED Headlamp has so many features you are looking for. We like to call this our "Dual Headlamp." It takes dual power sources (CR123A or AA batteries) and it also has a removable head that allows you to operate it as a hand-held or keychain flashlight when desired. Are you looking for compact? This headlamp is it. At a mere 2.51 inches in length, don't let the size scare you. It pumps out a maximum of 365 lumens and has an IPX-6 rating--submersible to 6.56 feet. The neutral white LED also is a great addition to those looking for a beam that provides a true color rendention. All these features make it in This headlamp has been in the top 3 headlamp sellers for Fenix.