The Coleman 600 Lumens LED Lantern with BatteryGuard stops battery drain so you'll have power when you need it most. Traditional battery-operated lanterns experience residual power drain as long as batteries are connected to the circuit, even when the device is turned off. With BatteryGuard, the batteries are automatically disengaged from the course when the lantern is switched off to extend their life by as much as 25%. This technology also reduces the chance of damaging corrosion so batteries can be stored in the device for years (up to their inherent shelf life). Additional features include a single button to turn the lantern on and off, up to 30 hours runtime on high using 3D batteries (sold separately), water resistance, impact resistance up to 2 meters (on dirt), and lifetime LED bulbs that never need replacing. Whether from power outages to roadside emergencies, this BatteryGuard lantern with a 12-meter beam gives you Power When You Need It.