Bluetooth Version: BT V5.1 Wireless Connectivity: Frequency Range: 2.402-2.480 GHz Transmission Distance: Up to 10 meters (approximately 33 feet) Talk Time: Approximately 4-5 hours Music Playing Time: Approximately 4-5 hours Charging Time: About 1 hour Earphone Battery: 30mAh Case Battery: 300mAh High-Fidelity Speaker Size: 13mm Earphone Size: Approximately 33.1 x 16.6 x 17.3mm Case Size: Approximately 58.1 x 50 x 23.7mm