Smart4u SS1 Wireless bluetooth Skiing Helmet Women Men Waterproof Bike Bicycle Cycling

Specification BrandSmart4u SS1ProductCycling HelmetMaterialEPS PCWeight540g L 500g M S Head Circumference52 56 S 56 58 M 58 62 L SizeS 280 x 215 x 223 mm M 280x 215 x 223 mm L 290x 226 x 230 mm ColorsWhite M L Black M L Blue S M Battery3 7V 300mAhRun TimeMax online time 15hMax conversation time 300minsCharge Time2 hoursElectrical ParametersDC 5V 1Abluetooth Connection DistanceMax 10mCharging InterfaceMicro USBWorking Temperature 20℃ 50℃Features bluetooth telephone function built in windproof noise microphone make outside calls clearer The helmet is equipped with low temperature resistant lithium battery it can work at 20℃ temperature Ten vents design make sure your head warm and dry PC material edge design and striking resistant function protect the helmet Pass European standard authority safety certification IPX4 waterproof Package Including 1 xSmart4u SS1Cycling Helmet1 x USB Cable1 x Manual