About this item Dual-Core LED Lamp Beads: The USB bike light is made of two LED-T6 lamps with a brightness of 2400 lumens; The dual-distance beam system produces wide, flat lights within a 120 range (max beam distance: 300 meters) to illuminate your dark road. Four Light Modes: With 4 different front light modes (high / medium / low / strobe) and 4 different rear light modes (high light / medium light / slow flashing / fast flashing) for your choice. Indicator Rechargeable and Smart: USB rechargeable with built-in 4400mAh long-lasting 18650 battery, standby time up to 24 hours; With smart indicator, keep track of lights power. Easy to install and adjustable bracket: RYACO bike lights are suitable for handlebars with a diameter of 20-32MM (0.79in-1.26 in), 360 degree swivel bracket for free headlight angle adjustment. IP65 Waterproof & Multiple Function: IP65 waterproof prevents splashing at any angle. Used for cycling, hiking, running, camping or other outdoor activities, it can also be an emergency light.