Lumos Ultra Ebike is the perfect helmet for your ebike ride. Featuring an integrated eye shield, front turn signals, and NTA-8776 certification. Length: 10.8” (27.5cm) Width: 9.4” (23.8cm) Height: 6.1” (15.5cm) Weight Standard 17.3 oz. (490g) MIPS 18.7 oz. (530g) LED Configurations Front: 30 White LEDs Front Left: 13 yellow + 13 white Front Right: 13 yellow + 13 white Rear: 64 Red LEDs Front and rear turn signal capable Automatic brake lights Battery Battery Life: 2-10 hours dependent on settings 3.7V 1300mAh Lithium Polymer rechargeable battery 3 hours charging time Wireless Bluetooth 4.2 Certifications US: Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older EU: CE EN1078:2012 + A1:2012 F1447 NTA 8776:2016-12 AS/NZS2063:2008 IPX6 Other Features Apple Watch (Apple Watch App along with its Gesture Recognition features currently in Beta. Read more here.) LS3 Sync Compatibility Team Sync: Read about how Team Sync works here. Lumos Firefly: Read about how Team Sync with Firefly works here. If you have Remote Lite: Flashing Patterns sync, All Power Off If you have Lumos Remote: Flashing Patterns sync, All Power Off, Turn Signals and Automatic Brake Lights Lumos Kickstart Lumos Matrix Lumos Ultra Sizing Capacity:- Handling time: 1-2 business days Shipping time: about 1 week, give it an extra 2-3 days to factor in any weekends/ holidays After-sale service detail(cancel, return, refund) and contact methods: https://lumoshelmet.co/pages/shipping-returns.