Introducing the D-Light USB Rechargeable Rear Light: your perfect cycling companion! With its sleek design and lightweight construction, this rear light is built to fit both aero and round seat posts effortlessly. Equipped with 3 versatile functions, it ensures your visibility on the roads. Whether you're riding during the day or night, this super bright light will keep you safe. And guess what? It has a remarkable 27 hours run time! So, go ahead and charge it via USB, attach it in a vertical position, and enjoy the top-notch performance of the D-Light Rear Light.