The topeak helmet light tailux is an ultra red led light with constant and blinking setting this topeak light will mount easily to helmets and any topeak bag or rack the lamp housing has been constructed from injection moulded plastic to give it a high quality and durable finish topeak helmet light tailux features 2 modes constant and blinking mounts easily on helmets topeak bags or racks size 3x3x17cm weight 14g lamp 05w ultra bright red led battery cr2032 x 1