Knitted material， fashion and keep warm with answer the phone in winter.Set-in MIC， available for cell phone to transmit the speaking phone to your audio devices directly so that the user can hand free answering phone up via the device.Set-in Li-ion chargeable battery， charge via USB Cable， long stand-by time.Specifications:Bluetooth Version: V3.0+EDRFrequency: 2.4026GHz-2.480GHzTransmission distance: 30 ft or soTransmission distance of MIC: ��3 ftLi-ion Battery:3.7V/120mACharging time:2.5 HRSStandby time:60 HrsContinuous working time: about 5HrsBluetooth name:Magic HatSize:Fits for head circumference 56-62cmSpeakers can be taken off so that you can wash the hatQuantity:1pcColor: Rose Red，Deep Blue，Black Package includes:1 x Bluetooth Music Headband1 x Charging cable