Bluetooth Version: BT V5.3 Frequency Range: 2.402-2.480 GHz Transmission Distance: Up to 10 meters (approximately 33 feet) Talk Time: Approximately 5-6 hours Music Playing Time: Approximately 5-6 hours Charging Time: About 2 hours Earphone Battery: 30mAh Case Battery: 250mAh High-Fidelity Speaker Size: 10mm