The ultralight Silva Trail Runner Plus headlamp allows you to exercise anywhere, at any time. The external four AA battery compartment for Trail Runner Plus can be carried on your waist or in a pocket, keeping the head unit featherlight and absolutely non-obtrusive. Worry about batteries running down faster in cold conditions? The external battery compartment can be carried inside a runners jacket—the perfect solution for winter endurance sports like cross-country skiing. Trail Runner Plus features Silva Intelligent Light® technology comprising both a strong light for distance, and the floodlight necessary for close-up vision.