1. Top equipments for bicycle and outdoor climbing fans. 2. Adopt 5 US XML-T6 LED color temperature: 5500K max luminous flux:2800LM it is specialized designed for the bicycle riding and outdoor climbing fans. 3. Three gears design: High/Mid/Fast Strobe. High bright 2800LM can work for about 3 hours and the low bright 800LM is 6 hours. 4. Power: adopts 4 x 18650 battery pack 2 series 2 parallel connnection design. 5. Charger: strong current charger has temperature protection over-charge protection and short circuit protection. Smart quick charger can finish work within 3.5 hours and automatically stops charging after charging full and the indicator light shines green. Input: 100-240V AC 50/60Hz; Output: 8.4V. 6. The connection cables all adopt 3.5mm diameter which are very durable and the link interfaces are very tight. 7. The light shines green when it connects to the power supply in order to recognize the switch position at night. 8. Aluminum alloy light cup glass lens. The forming facula 90-degree beam angle is excellent for bike riding. 9. The included strong high-quality rubber rings apply to all bicycles very simple and easy to use.