PETZL - Kit Belt NAO +, Extension Cord and Belt Clip for NAO + Headlamp INTENDED USE: Allows the rechargeable battery for the NAO + headlamp to be moved, thanks to a 106.5 cm extension cord and a clip for attaching the rechargeable battery to a belt or a backpack. LIGHT FIT: Weight on the head is reduced to 130 grams. STAY CHARGED: Increases battery life by keeping the rechargeable battery in a pocket, protected from cold. ACTIVITY USE: Ideal for trail running, cross-country skiing, and mountaineering. WEIGHT: Weighs only 59 grams.