The Exposure Red Eye Micro is, without a doubt, the smallest rear taillight we've ever seen. Taking full advantage of Exposure's Smart Port Technology Plus, it simply plugs into the port and switches on and off with the light. It works with the Diablo and Joystick helmet mounted headlights. The Rey Eye Micro weighs about the same as a Presta valve stem and is smaller if you can believe it. There are no wires, and there's not a darn thing fancy about it. It's just a smart idea, and a tidy way to make yourself more visible when you're out in traffic in low light conditions. Exposure Lights have a two year warranty against defects in materials and workmanship.