High definition Bluetooth®4.2 technology. Earbud case is also a 2000 mAh power bank. Sleek aluminum case with color silicone band. Wireless range of over 32 fee away. Provides up to 4 hours of play/talk time. Full power bank charge will recharge earbuds 15 times. These are the revolution of Bluetooth® speakers. No wires at all, anywhere to be seen. The case charges the earbuds but can also charge other devices as it acts as a power bank as well. Sport your specific color with the silicone color band at the top of the case.