168.5g, 50 Lumens: The Nitecore NC10000 is a compact and lightweight 10,000mAh power bank specifically designed for highland activities. It features 21700 Li-ion batteries that can withstand high altitudes, as ordinary battery cells in common power banks may swell and become damaged due to low air pressure. With its user-friendly, single-button interface and IPX5 rating, the NC10000 also has a dual-LED 50-lumen light that can last up to 30 hours.Dual light output & Specially designed high altitudes powerbank!