The Petzl ACTIK CORE is the ideal rechargeable headlamp to have with you when you're running, trekking, or mountaineering. Casting up to 600 lumens, the ACTIK CORE features the HYBRID CONCEPT design that allows you to switch between the rechargeable battery and AAA batteries. With its FULL-TILT lamp body, this headlamp can be worn various ways and still gives you the ability to aim the light where you want it. Programed to provide 50:50 BURN-TIME-TO-BRIGHTNESS performance, you'll experience more brightness during the first half of the lamp's rated burn-time. These are just a few of the PETZL DIFFERENCES worth justifying.