The Lumos Nyxel is a smart cycling helmet from Lumos that focuses on safety, comfort, and advanced features for urban commuting. As the company's "safest, smartest helmet" to date, it includes integrated LED lights, turn signals, and a redesigned fit. o Length: 10.67" (27.1cm) o Width: 8.19" (20.8cm) o Height: 5.67" (14.4cm) o S: 52-56cm | 20.5-22in o M: 55-59cm | 21.6-23.2in o L: 58-63cm | 22.8-24.8in · Weight · Nyxel Non-MIPSs: 380g |M: 390g |L: 410g · Nyxel MIPSs: 400g|M: 410g|L: 430g · LED Configurations o Front: 28 White LEDs o Rear: 28 Red LEDs o Turn signal capable o Automatic brake lights (Only MIPS+ Quin Version) · Battery o Battery Life: 3-16 hours dependent on settings o 3.7V 1000mAh Lithium Polymer rechargeable battery o 4 hours charging time · Wireless o Bluetooth 5.0 · Certifications o US: Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older o EU: CE EN1078 o AS2063 o ASTM F1447 · Other Featureso Apple Watch (Apple Watch App along with its Gesture Recognition features currently in Beta. Read more here.) · LS3 Sync Compatibility o Team Sync: Read about how Team Sync works here. o 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 o Lumos Kickstart o Lumos Matrix o Lumos Ultra E-Bike