[LATEST V5.0 BLUETOOTH TECHNOLOGY] The latest Bluetooth V5.0 technology upgrades the Bluetooth beanie function, which is suitable for most Bluetooth-enabled devices. Just sync to any Bluetooth device in a few seconds, hands-free connection, including rejecting/answering calls, and wirelessly listening to music within a range of 33 feet (10 meters) while staying warm in winter.[Universal wireless technology] Universal Bluetooth v5.0 technology for hats with Bluetooth headsets has forward/backward compatibility and can be connected to all other Bluetooth-enabled media player devices.[Excellent battery performance] Bluetooth Doudou headset has a built-in lithium-ion battery and a micro USB charging function. The Bluetooth talk/play time is 6-8 hours, the standby time is 21 hours, and the charging time is only 2 hours, so you have less Time to recharge and have more time to enjoy music and phone calls. (Including USB charging cable)[Washable material] The wireless bluetooth cap can be completely washed, unisex, stretchable, one size fits all sizes and shapes. Thicker and higher-quality knitted materials keep warm, which is a best friend gift. Fine workmanship, comfortable and warm. Does not fall off, deform, or shrink.[Keep warm] The headset Bluetooth cap provides a pair of beautiful warm gloves and a Bluetooth hat to keep warm in winter. It is very suitable for daily wear, including indoor and outdoor activities, such as camping, biking, barbecue, fishing, jogging, dog walking, skiing, skiing, running, traveling, hiking, motorcycles. It is also an ideal gift for birthday, Thanksgiving, Christmas and New Year.