Momoday Bluetooth Hat Bluetooth Music Hat Knitted Winter Hat Magic Hat Hands-Free Music mp3 Speaker Hat Women/Men Winter and Spring Warm Hats Beanie Hat for Smartphones V3.0+EDR Bluetooth version,available for most of devices with Bluetooth function. 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. Support power display on iphone. Set-in Li-ion chargeable battery ,charge via USB Cable,long stand-by time