Dual power mode allows for saving battery when not as much light is needed; Rechargeable NiMH battery is airline safe in carry-on and checked luggage; Battery lasts up to 10 years with proper care; 89% of beam lumens in center beam means no lost light to stray light and less backscatter; Tough composite body - will not corrode; Pistol grip for a comfortable hold; Tough rubber bezel protects against impact; Lumen booster technology improves LED efficiency by pulling heat away from the LEDs; IP67 Waterproof