Description: Built-in 350mAh 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: 500mah 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*2cm Package Included: 1*warning taillight 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. 5.We have an exclusive patent, please confirm the authentic purchase, quality assurance