MoKasi&reg; Wireless Bluetooth Music Beanie Hat Washable Winter Warm Soft Knitted Trendy Cap with Stereo Headphone Headset Speaker Mic Hands-free (Black) 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 Enjoying music via Bluetooth connect; Long working distance up to 10 meters Set-in Li-ion chargeable battery, charge via USB cable, long stand-by time Speakers can be taken off so that you can wash the hat