Feature:100% brand new and high quality.Quantity:1SetKnitted material、 fashion and keep warm with answer the phone in winterSet-in MIC、 available for cell phone to transmit the speaking phone to your audio devices directly so that the user can hand free answeringSet-in Li-ion chargeable battery、 charge via USB Cable、 long stand-by time.V3.0+EDR Bluetooth version、available for most of devices with bluetooth function.Specifications:Bluetooth Version: V3.0+EDRFrequency: 2.4026GHz-2.480GHzTransmission distance: 30ft or soTransmission distance of MIC: ＋3 ftLi-ion Battery:3.7V/120mACharging time:2.5 HRSStandby time:60 HrsContinuous working time:about 5HrsSize:Fits for head circumference 56-62cmSpeakers can be taken off so that you can wash the hatMaterial:Woolen yarnPackage Content:1PC Warm Bluetooth Smart Hat1PC Instruction Manual1PC Charging Cable