Suitable for head circumference: M, 22.4 in-22.8 in (57cm-58cm), L, 23.2 in-23.6 in (59cm-60cm) XL, 24 in-24.4 in (61cm-62cm) XXL, 24.8 in-25.1 in（63cm-64cm）Bluetooth function:1. Can call, answer, reject the call2. Automatic answering calls3. Support FM4. Can connect to music from GPS or mobile phone5. Stereo music6. DSP noise and wind sound processing, can still maintain a clear call at high speed7. Waterproof sunscreen dustproof and durable8.3000 mAh polymer lithium battery, can stand for 30 days, or work continuously for 80h9. Use USB to chargeAbout the helmet:1.ABS helmet body, high impact resistance, heat resistance, low temperature resistance2. Aerodynamic ventilation system, smooth ventilation3. Removable lining4. Double sun visor, external HD anti-fog, internal anti-glare, UV protection5. Weight about 1.75kg (3.8 lbs)About our services:We believe 1% creativity + 99% hard working = products which can make all of you satisfied. And now we are trying best to carry our products to you and hope you guys will love them.If you have any questions or questions, please feel free to contact us and you will get a reply within 24 hours.
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