Lumos Ultra Helmet Men's Clothing-Swim Up to 20 hours of

Up to 20 hours of battery life in demanding use cases

quick release skewer

24 hours if applied in cool or humid weather conditions

Shimano's Di2 technology provides easy

Simply connect the trainer to the rear wheel of your bike

Lumos Ultra Helmet Men's Clothing-Swim Up to 20 hours ofLumos Ultra is our most popular bike helmet that comes with integrated LED lighting, turn signals, and smart features to keep you safe in one sleek package. Details: Size Length: 10. 83" (27. 5cm) Width: 8. 27" (21cm) Height: 6. 10" (15. 5cm) Weight 13. 05 oz. (370g) LED Configurations Front: 30 White LEDs Rear: 64 Red LEDs COB LEDs for a more uniform look Turn signal capable Automatic brake lights (optional upgrade) Battery Battery Life: 4 10 hours