Extreme Adventure Headlamp. A rechargeable headlamp that will take durability and power to the next level on your adventures, the Princeton Tec Apex Li is rated IPX7 water resistant and provides both a powerful spot beam and a bright flood light. Operated with two large buttons that make switching between modes quick and intuitive, the light offers 550 lumens and runs for upwards of 13 hours. The rechargeable lithium ion battery pack comes clipped to the head strap and can be moved to your belt, pack, or jacket with an extended power cable for optimized comfort and incredible cold weather headlamp performance. Included with Apex Li: Rechargeable battery Battery pack bracket USB charging cable Extension cable Nylon headstrap + crown strap Velcro loop strap