The Petzl Swift RL is a powerful, multi-beam rechargeable headlamp with an impressive 900 lumens of brightness and high-tech reactive lighting that automatically delivers the specific illumination you need for the conditions. Its streamlined, close-fitting design makes it ideal for trail running or other aerobic activities. Reactive lighting means that the headlamp adjusts the brightness and pattern to optimize battery use and ensure that you receive the illumination you need. This automatic adjustment offers brightness up to as much as 900 Lumens, yields a longer burn time than standard manually-adjusted headlamps, and requires less in-use fiddling on your part. A reflective, ergonomic headband has two-part construction for stability during dynamic activities. The single allows you to manually toggle between brightness, lighting modes and locked mode. You can also lock the headlamp so that it doesn’t accidentally activate when stored and inadvertently wear down the batteries.The headlamp is powered by a 2350 mAh Lithium-Ion battery that charges conveniently via a USB port. The battery performs well even at low temperatures and charges in 6 hours. A five-level gauge gives you precise information about the remaining battery life. Water-resistant and suitable for all-weather use, the Petzl Swift RL headlamp is available in your choice of colors options.