The Serfas Aero Tail Light is designed for optimal visibility with an enhanced side visibility design and 130 lumens of brightness. It features 2 solid modes (High: 50 lumens for 1.5 hours, Low: 15 lumens for 5.5 hours) and 3 flash modes (Daytime Flash: 130 lumens for 19 hours, High Flash: 75 lumens for 10 hours, Low Flash: 20 lumens for 22 hours), plus an Auto Safe Mode that extends runtime by an additional 45 minutes. The unique fin lens design and 270° field of rear and side illumination ensure you're highly visible from all angles. Powered by a 500 mAh Lithium Polymer battery, it includes a USB-C rechargeable feature and an LED charge indicator. Weighing just 52 grams, this tail light comes with a Serfas Aero Tail Light Bracket, USB-C charging cable, and two rubber multi-straps for easy mounting. Perfect for cyclists seeking safety and long-lasting performance, day or night.