PETZL Zipka Classic Headlamp - SS17 100 LUMEN: maximum output STANDARD LIGHTING TECHNOLOGY: beam switches to reserve mode when batteries are getting low in order to preserve remaining battery life ZIP RETRACTABLE CORD: allows headlamp to be worn on the head, wrist, or mounted on other surfaces COMPATIBLE: with rechargeable Ni-MH and lithium batteries BATTERIES INCLUDED: headlamp runs on three AAA/LR03 batteries