oenbopo Women's Winter Hat Warmer Bluetooth Smart Music Hat Cap Handsfree Speaker Women's winter Hat Warmer Bluetooth Smart Music Hat Cap Handsfree Speaker Luxuriously soft and silky Warm and soft beret for your cold winter Free size, one size for all with elastic Great gift ideal! , 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 Continuous working time:about 5Hrs