Main parameters: Product model: Intelligent translation Bluetooth headset Product certification: CE, ROHS, FCC, etc. Bluetooth solution: Bluetooth V5.4, high-definition dual ear call Product chip: Zhongke Lanjun 5656C2 Operating frequency: 2.402 - 2.480 GHz Supported protocols: A2DP, AVRCP, HFP Transmission distance: Unobstructed 15 meters Speaker unit: F14.2 copper ring speaker Standby time: 150 days Working time: Approximately 8-9 hours, the charging case can charge the headphones 4 times or more Charging time: 1 hour Communication distance: Unobstructed 15 meters Headphone battery capacity: Pure cobalt 90 milliampere-hours Charging case battery capacity: 300 milliampere-hours with protection board Charging method: Type-C charging