This bluetooth headband can keep your head warm while allowing you to enjoy music without additional headphones, bluetooth Wireless range up to 33 feet (10 meters) Built-in microphone: 3-button control panel makes this speaker headband easy to answer calls, available for hands-free, find songs, and control volume. Washable Earphone: Built in rechargeable Li-Ion battery and charge via USB Cable, speaker driver and battery can be taken off, easy for washing.