Focusable LED lighting, long burn bulb, and high output bulb provide lighting to meet all needs, from hiking to tracking game. Two independent battery sources: two AA batteries housed in the head unit and four C batteries (sold seperately), contained in the separate battery pack give you hours of power for the lighting options. The two AA batteries power the LEDs for up to 25 hours and the long burn bulb for eight hours, while the four C batteries run the LEDs for up to 150 hours, long burn battery for more than 24 hours and the high output bulb three to five hours. Lighting options are selected by push button switch on headlamp unit. Waterproof to 33 feet. Spare dual filament bulb housed in unit. Weight: Headlamp, 6 oz. , battery pack, 16 oz.