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USB rechargeable: Charge from a compatible USB power source according to the supplied instructions
Do not use this product for an activity that requires a different helmet standard unless the exact certification label explicitly covers that activity
Tighten straps evenly
Inside with small mesh and spring belt for placing small things like credit card or small tools
Care and compatibility
Photochromic Bike Glasses for Cycling & Running Color:Navy USB rechargeable: Charge from aVICTGOAL VA309 photochromic bike glasses for cycling and running Compare these sports glasses for cycling, running and outdoor routes with changing light. The photochromic lens is designed to shift between a lighter and darker tint in response to ultraviolet exposure. Response speed and final tint vary with UV level, temperature, exposure time and lens condition. Feature checklist Photochromic lens: tint adjustment is gradual rather than