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The Serfas TL80 is a high-powered, compact, USB rechargeable tail light that will keep you visible from more than a mile away. The TL80 can be attached to just about anything and features an angle-adjustable mount to put on your frame or seatpost. Serfas tests all their lights in house on their traceable integration sphere to ensure measurements in lumens, run times, color temperature, and lumen curves are measuring correctly during each test run. As the name infers, you’ll get a true 80 lumens for up to two hours of riding; it then automatically switches to the low setting for the remainder of the battery life. Serfas Lights are RoHS compliant, which means that Serfas does not use any environmentally harmful products in the production of their lights. Choose a brand that cares for the earth.