The Coleman 600 Lumens LED Lantern with Battery Guard stops battery drain so you'll have power when you need it most. Conventional battery-operated lanterns experience residual power drain as long as batteries are connected to the circuit, even when the device is turned off. With Battery Guard, the batteries are automatically disengaged from the circuit 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 rotating dial to easily switch between high, medium, low, and flashing modes, up to 14 hours runtime on high using 4 D batteries (sold separately), water resistance, impact resistance up to 2 meters (on dirt), and lifetime LED bulbs that never need replacing. No matter the situation, from power outages to roadside emergencies, this Battery Guard lantern with a 16-meter beam gives you Power When You Need It.