The BatteryGuard technology on the Coleman 425M LED Flashlight stops battery drain, so you ll have power when you need it the most. Conventional flashlights experience residual drain as long as the battery is connected in the circuit, even when the light is powered off. When you switch off your Coleman flashlight, BatteryGuard technology completely disengages the battery to maintain brightness twice as long, and extend battery life by 25%. It also reduces damaging corrosion, so batteries can be stored in your flashlight for years. The flashlight upholds its durability with a strong aluminum exterior and rubber-edged bezel that s water and impact resistant to falls of up to two meters. With a long-lasting battery and an enduring exterior, you can trust that this high-powered flashlight will be ready for anything, even when you re not.