Serfas USL-TL80 USB Taillight The industry's most technologically advanced safety lights All lights are RoHS compliant and all testing is done in house More efficient LEDs & high quality lenses to increase brightness & clarity Produces over 80 Lumens, USB Rechargeable, charge indicator lights Over 1 mile of visibility, one of the brightest taillights on the market Small, Lightweight, Compact body; Includes mounting bracket, backpack clip and is rack compatible 4 modes: Steady high, Steady low, Flash and Alternating Flash Run time: Up to 2 hours on High Steady mode (80 lumens)