Bluetooth hat,DigiHero Wireless Bluetooth Beanie Musical hat with Stereo Speaker and MIC 8 Hours Working Time for Outdoor Sports,Built-in Mic Style and Tech Combine:Stay warm and enjoy hands-free music and calls in winter The Latest Blutooth V3.0 Technology: Easy and fast syncs to any Bluetooth device in seconds. Built in rechargeable Li-Ion battery,about 5 hours talking/playing time, 2 hours charging time,60 hours standby. Fully adjustable to fit any head size.Please use the USB cable to charge it before start using the bluetooth beanie Perfect for outdoor sports, running, skiing, skating, hiking, working out,dog walking, holiday travelling, and so on.