Tenergy Wireless Bluetooth Hands-Free Headband (built-in stereo speakers and microphone for calls), Color Blue/Black Bluetooth Version V4.1 +EDR. Compatible with all Bluetooth devices Built in rechargeable Li-Ion battery provides up to 6 hours of playtime. (USB charging cable included) Wireless range up to 33 feet Built-in microphone allowing you to talk hands free Washable headband after removing headphones