Nitecore Carbon Battery 6K USB-C 6000mAh Power Bank Black. Its compact size and large battery capacity give it an energy density of 245.5 WH/kg making it the highest density among its competitors. Besides powering your phone the Carbon Battery 6K can be used to double or triple the runtime of Nitecore headlamps such as the NU40 NU43 NU50 and HC65 UHE. By connecting directly to the headlamp the Carbon Battery 6K activates the headlamps' Performance Mode ensuring long-lasting illumination and stronger brightness.The Carbon Battery 6K features a USB-C port for easy connection and charging. To check the remaining power simply short-press the power button to illuminate the three red power indicators. Additionally for added safety the battery includes a rear red light that serves as a signal light at night. The Carbon Battery 6K is crafted with a carbon fiber shell making it sturdy and exceptionally lightweight at only 3.10 oz. Its seamless design renders it impact-resistant up to 1 meter and rated IP68 waterproof perfect for outdoor adventures. Specifications for Nitecore Carbon Battery 6K USB-C 6000mAh Power Bank: Manufacturer: Nitecore Battery Capacity: 6000 mAh Color: Black Features of Nitecore Carbon Battery 6K USB-C 6000mAh Power Bank Has a capacity of 6000mAh Can be used as a power extender for Nitecore headlamps USB-C Charging Power indicators let you know when it's time to charge Features a red signal light Package Contents: Nitecore Carbon Battery 6K USB-C 6000mAh Power Bank Nitecore Carbon Battery 6K Nitecore CARBON6K: Carbon Battery 6K USB-C 6000mAh Power Bank Black