5000 Lumen Bright Headlight Headlamp Flashlight Torch 3 CREE XM-L2 T6 LED with Rechargeable Batteries and Wall Charger for Hiking Camping Riding Fishing Hunting XM-L2 T6 LED light, 5000 lumen, powered by 2 pieces of rechargable batteries(3.7v, 4200 mAh). Long Battery Life (2-3 hours on high / 5-6 on medium) The rear flashing "bonus" light is a clever and very useful feature. It also came with bonus headgear attachment which is also useful for non bicycle tasks. Lithium Ion Battery 2x18650 batteries (BATTERIES INCLUDED) CREE XML T6 ,5000 Lumen Bicycle Light, charger and rear warning light