Description: Built-in lithium-polymer battery 500 mAh, fast USB loading, many charging methods to choose a strong water resistance, no fear of wind and rain, normal lighting during heavy rain 6 modes: strong light, medium light, weak light, free flashing, fast Flash, serial flash One lamp has many features, incredibly many functions we have an exclusive patent, please confirm the authentic purchase, quality assurance specifications: Product name: Multifunction Rear Bicycle Warning Light Battery: Built-in Lithium battery 500 MAH Charging: Direct Loading via USB Duration : 3 hours discharge: 6 hours mode: six speed mode weight: 20 grams coating: plastic abs outdoor in yellow style: red light / white light size: about 3 * 2 cm package contains: 1 * rear warning light Notes: 1. Do not load above 5 V / 1 A to prevent damage to the battery 2. Do not look or guided by light Directly in the eye. 3. Keep away from children. 4. Do not use in water for a long time. 5. We have an exclusive patent, please confirm the authentic purchase, quality assurance