The Metal True Wireless Earbuds and Powercase are the future of Bluetooth earbuds. As you see, there is no wire connecting the earbuds. Making them true wireless earbuds. The carrying case also doubles as a charging case for the earbuds. Once the case is charged it can be used as a portable charger for your earbuds. The case features a 400mAh battery. With over 3 hours of talk time these earbuds are a must for any traveler. The ergonomic design of the earbuds keep them in place on the go. It takes 2 to charge the earbuds from 0 to 100%. Bluetooth working range is 10 meters (33 feet). Bluetooth version 4.1. Includes interchangeable earbud tips, small, medium, large, and micro USB charging cable. Earbuds include a microphone and music controls for hands-free operation.