Unisex Winter Thicken Wireless Bluetooth Music Hat Cap Headset Smart Speaker Description:V3.0+EDR Bluetooth version，available for most of devices with bluetooth functionKnitted material， fashion and keep warm with answer the phone in winterThe hat can be WashedSet-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 on via deviceSet-in Li-ion chargeable battery， charge via USB Cable， long stand-by timeSupport power display on iPhone Specifications:Bluetooth Version: V3.0+EDRFrequency: 2.402GHz-2.480GHzTransmission distance: 10M or soTransmission distance of MIC: ≤1mLi-ion Battery: 3.7V\/100mACharging time: 2HRSStandby time: 60 Hrs or soContinuous working time: about 3.5HrsBluetooth name: Magic HatSize: Fits for head circumference 56-62cm\/ 22.05"-24.41" Package Included:1 x Warm Bluetooth Smart Hat1 x Charging Cable1 x English Instruction Manual More detail: