Built-in 300mAh polymer lithium battery, USB fast charge, multiple charging methods to choose from Strong waterproof, no fear of wind and rain, normal lighting in heavy rain 6 modes: strong light, medium light, low light, slow flash, fast flash, burst flash One lamp has multiple functions, amazing multiple functions Specifications: Product Name: Multifunctional Bicycle Warning Tail Light Battery: 250mah built-in lithium battery Charging: USB direct charging Duration: 3 hours Discharge: 6 hours Mode: Six-speed mode Weight: 20 grams Shell: ABS engineering plastic outer yellow Style: red light / white light Size: about 3*2om Package Included: 1*warning taillight Notes: Notes: 1. Do not charge over 5 V/1A to prevent battery damage 2. Do not look at or shine the light directly in eyes. 3. Keep away from children. 4. Do not use in water for long time.