This is a Winter Warming Artifact. It is a Bluetooth Earmuff That Can Listen to Music. the Bluetooth Function has Stereo Music & Calls, Long Range, Intelligent Compatibility, Volume Increase & Decrease, Arbitrary Switching, One-click Compatible Connection Anytime & Anywhere, & Can Connect to Various Devices at Any Time. It is Truly One-click Compatible Connection. the Bluetooth Control Panel is Simple to Operate & Easy to Use. the USB Charger Port is Directly Connected to the USB Cable to Charge the Bluetooth, Which is Very Convenient. the Comfortable Fabric is Coral Fleece, Warm & Comfortable, with Multiple Production Processes, & Not Easy to Pilling.