Giant's Numen+ TL23 LED USB Taillight boasts 2 bright LEDs and a .5 watt light so you get noticed out on the road. If that wasn't enough, you have five different high-visibility light modes to choose from. The TL2 runs for up to 55 hours, and the battery is USB rechargeable. The tool-free mounting hardware is fast, easy to use, and fits on most seatposts and frames.