u-Box 2 x Cree XML U2 5000 Lumen LED Bike Headlight Headlamp with 4*18650 Battery Pack, US Charger, Rubber Rings and Adjustable Headband Super Bright Cree XM-L U2 Bicycle Headlamp Headlight, Output bright can come to max 5000 lumen Internal wiring applies high efficient booster circuit utilize batteries in the largest extent Can be used as headlamp with adjustable headband or bicycle light with rubber rings Waterproofing design,Easy to install and use Perfect fit for various outdoor sports, such as Camping, Traveling, Hiking,Cycling, etc