A-szcxtop Bluetooth Music Hat - Bluetooth Stereo Headphones, Microphone, Hands Free System and Rechargeable battery - Compatible with Mobile Phones, iPhone, iPad, Laptops, Tablets, Smartphones (Black) Bluetooth Hat - Keep warm while listening to music from smartphones and tablets. 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. Set-in Li-ion chargeable battery,charge via USB Cable,long stand-by time.