ROCKBROS Front/Side/Rear Warnig Light Cycling Helmet Breathable Vents Mountain Road Bicycle Helmet

ROCKBROS Front/Side/Rear Warnig Light Cycling Helmet Breathable Vents Mountain Road Bicycle Helmet - Blue Integrated flow vents to reduce head temperature and resistance, will always keep you cool and dry when ridingFront warning + side warning + rear warning light, more secure at nightEquipped with an adjustable clasp, free to adjust the head circumference to fit your headDetachable integrated-molded lining for easy cleaningSpecification:Power: USB chargingBattery: 2000mAhTime: (Mighty)about 4 hours; (Low)about 9 hours; (Flash)about 24 hours; (Only side & rear warning light) about 1 monthHead circumference: 57-62cm