The Petzl Nao Plus Belt Kit provides us with a nifty 42-inch extension cord and battery clip for the Nao Plus headlamp, allowing us to attach the battery to our pack or belt for reduced bulk and greater battery life in the cold. Removing the battery from your head reduces the Nao Plus Headlamp to a scant 130 grams for reduced fatigue and greater comfort. This belt clip and extension cord are ideal for trail runners, nordic skiing, backcountry excursions, and mountaineering use.