Serfas USL-5R USB TaillightThe Serfas USL-5R packs a punch in a small package. With 70 lumens of brightness you are sure to be seen on the streets or on the trail. The 5 LED's give the rider a 180 degrees of visibility and can burn up to 10 hours for those epic rides. The Serfas USL-5R removes in seconds making it a great on the go light. The beam carry distance on the USL-5R can be seen from at least 1000 yards before dissipation.