The Topeak Tail Lux Helmet Light 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 Tail Lux Helmet Light Features2 modes: Constant and BlinkingMounts easily on helmets, Topeak bags or racksSize: 3 x 3 x 1.7cmWeight: 14gLamp: 0.5W Ultra-bright Red LEDBattery: CR2032 x 1 (included)Burn Time: 50hrs Constant / 100 hrs Blinking