3 Modes of lighting: High, Medium, Low plus Strobe function. Light output range of 50 lumen's to 200 lumen's. PiggyBack charger/holder charges the light and spare battery simultaneously. Super bright C4 LED has a 50,000 hour lifetime and is impervious to shock. Features dual independent head and tail cap switching This LEDlight produces up to 48,000 Candle/200 Lumen's (High), up to 24,000 Candle/100 Lumen's (Medium) and up to 11,000 Candle/50 Lumen's (Low). Run times of up to 2 hours (High), 3.75 hours (Medium), 7.25 hours (Low) and 5.5 hours (Strobe). Deep dish parabolic reflector produces a long range targeting beam with optimum peripheral illumination. Optimized electronics provides regulated intensity. Constructed of machined aircraft aluminum with non-slip rubberized comfort grip. Includes both AC and DC charge cords and a PiggyBack charger/holder that charges both the light and spare battery simultaneously.