The BatteryLock system on a Divide + 250L LED Flashlight stops battery drain, so you'll have the power you need when you need it most. On a normal flashlight, there is always some residual drain as long as the battery is connected in the circuit, even when the light is off. With a simple twist of the bezel, you can completely disengage your batteries, so they can stored in your flashlight for years (up to their inherent shelf life). You'll also reduce the toxic corrosion that can damage your flashlight. The strong, lightweight aluminum construction is impact and water resistant, while the single button makes operation of your flashlight simple. No matter the situation, from power outages to roadside emergencies, a flashlight with the BatteryLock system is ready, even when you aren't.