JUSTUP Waterproof 2400 Lumen U2 LED Rechargeable Mountain Bike Road Bike Headlight Bicycle Light 4 Modes Bike Lamp with 6400mAh Rechargeable Battery Pack and Charger for Cycling Internal wiring applies high efficient booster circuit utilize batteries in the largest extent. Super Bright Bicycle Headlamp Output bright can come to max 2400 lumen. Intelligent circuit control, 4 switch modes.Timely battery indicator helps you master battery condition. Perfect fit for outdoor sports, such as camping, traveling, hiking. Waterproofing design,Easy to install and use.