Serfas USL-R Taillight
The Serfas USL-R has 1 bright LED that produces 12 lumens worth of light and allows up to a 1/4 mile of visibility for oncoming traffic. It is USB rechargeable and requires no external batteries. The USL-1 has a burn time of up to 6.5 hours. The USL-1 also has a Hi-Beam, Lo-Beam and 2 flash modes.