The Fenix HM70R Rechargeable Headlamp features a high-capacity 21700 battery, that not only boosts this headlamp to a maximum 1600 lumens, but also allows for a 100 continuous hour runtime when using 30 lumens on Low. Press and hold the large, glove-friendly switch to change over to the Functional mode to access two levels of neutral white light, a red reading light, and a red flash. The hidden USBC port adds to its IP68 dustproof/waterproof rating and allows you to quickly charge your headlamp with a 2A charging current. Battery level indicator, intelligent memory, and lock out function, round out the features of the Fenix HM70R Rechargeable Headlamp.