Taillight & brake light. Attaches to the top side of enduro style (XR, KDX, etc) rear fenders. Dimensions: 2 3/8" x 4 3/4" x 1 3/4" tall. This light is a popular replacement for the gigantic stock XR650L taillight. Functions as taillight and brake light.Fits perfectly into the taillight pocket on the XR650L.