Version of Bluetooth: BT V5.1 Wireless Communication: Regularity Transmission Range: Up to 10 meters (about 33 feet) at 2.402-2.480 GHz Talk Time: roughly four to five hours Time Spent Playing Music: roughly four to five hours It takes around an hour to charge. 30mAh battery for the earphones and 300mAh for the case Size of High-Fidelity Speaker: 13mm The case measures about 58.1 x 50 x 23.7 mm, while the earphones measure about 33.1 x 16.6 x 17.3 mm.