The IKO headlamp from Petzl combines multiple LEDs and a semi-rigid headband that remains stable so you can run, climb skiing and hiking and stable lighting illuminates your path. The lights themselves switch between flood light modes beam and mixed mode and the battery pack is located at the rear for even weight distribution. Air-Fit headband is fully adjustable therefore it can be attached to Petzl helmets. Petzl comes with three AAA batteries. but you can buy a Petzl battery to maintain the same power at any time of the year.