The Petzl Actik Core Headlamp is a Hybrid headlamp for versatility on the trail. The Hybrid status allows it to be used with the included CORE rechargeable battery, but it can also be used with 3 AAA batteries (sold separately). Light up the darkness when pitching camp late, cooking dinner or even hiking through the night. Features of the Petzl Actik Core Headlamp Powerful (350 lumens), versatile headlamp Headlamp comes with CORE, a battery that is rechargeable via USB port ACTIK CORE is a Hybrid headlamp: it comes with the CORE rechargeable battery, and is also compatible with three AAA/LR03 batteries Two beam patterns (wide or mixed) and several lighting modes meet the need for High-Performance lighting in outdoor activities: proximity or distance vision and rapid movement Red lighting preserves night vision and keeps from blinding other members of the group Reflective headband helps you to be seen when a light is shone on it, and is equipped with an emergency whistle for rescue situations