The Bobbin LED Rack Fitting Rear Light is a neat Light that fits to most rear pannier racks with ease (Check compatibility before purchase). The light fits securely to your rack via nuts and bolts. Already own a rear reflector as well as a light? The Bobbin LED Rack fitting rear light comes equipped with its own reflector as well as an LED which gives for a much more visible light pattern. Coming supplied with 2 x AA.