Product name: USB charging front light Power supply: 2000 mAh polymer battery Design: USB can charging front and rear lights, built -in 2000 mA -charging lithium batteries for headlights, built -in for 330mAh charging lithium batteries for taillights. Product size: 14.6*8.8*3.9cm Four types of light mode options: The front lights and taillights use a one -button switch, and there are four lighting modes according to your preference. Including full brightness, semi -brightness, fast flashing and slow flicker. Easy to install: The front light is equipped with a installation bracket, which can be easily fixed on the handlebar. There are four openings of the silicone installation belt for headlights and taillights, which can be close to most sizes of seat columns. The front lights and taillights can be easily loosen and tightened, without tools. Mobile: This bicycle lamp set has a variety of functions, which can be used for bicycles, hiking, camping or any outdoor activities, and can be used as emergency flashlights. It is very suitable for riding at night or in visibility and places. Therefore, just start the adventure with us.