The Topeak Headlux Helmet Light helps you ride safe and be seen at night. Innovative double sided helmet mounted light shines white facing forward and red towards the rear and features 4 LEDs with wrap around lenses for visibility from all angles. Top mounted button controls constant and blinking modes.Topeak Headlux Helmet Light FeaturesBattery: CR2032 x 2 (included)Control / Burn Time: 3 Modes70 hr White Constant / Red Blinking100 hr White Blinking / Red Blinking50 hr White Constant / Red ConstantLamp: 2 white LED’s and 2 red LED’sLamp Housing: Injection molded plasticLight Output: 6 cdMount: Helmet / Road bike dropbarSize: 6.5 x 3.5 x 3 cm / 2.6” x 1.4” x 1.2”Weight: 24 g / 0.84 oz (Light)