Bluetooth Beanie Hat Headphone blueear Wireless Winter Knit Hats with Stereo Speaker and MIC 8 Hours Working Time for Outdoor Sports 100 % Acrylic material, kintted beanie, fashion and keep warm with answering the phone in winter V4.1+EDR Bluetooth version, available for most bluetooth device Bulit-in Mic and stereo speaker, available for cell phone to transmit the speaking phone to your audio devices directly so that the user can answering phone Bulit-in Li-ion chargeable battery, charge via USB cable, long stand-by time The magic Bluetooth hat is your best choice when doing outdoor sports like walking, jogging, cycling, touring, fishing, etc