The Coleman® 300 Lumens LED Headlamp with BatteryGuard™ stops battery drain, so you'll have power when you need it most. BatteryGuard technology automatically disengages batteries from the circuit to extend battery life by 25%, and it reduces corrosion so batteries can be stored in the device for years (up to their inherent shelf life). You can trust that your BatteryGuard headlamp will be ready for anything, even when you're not.