SG-11 Pro Smart Audio Sunglasses, Bluetooth 5.4 Air Conduction Glasses with UV Protection Anti Blue Light HIFI Sound

Material: ABC + PC Bluetooth solution: Bluecore AB5756C Bluetooth version: 5.4 Supported Bluetooth protocols: HFP, A2DP, AVRCP, HSP, BR + EDR + BLE Bluetooth operating frequency: 2.4 GHz - 2.48 GHz ISM Band Effective Bluetooth range: 10 - 15 meters Speaker power: 30 mW Frequency response: 100 Hz - 10 KHz Speaker unit: 16 Ω dynamic 1509 speaker Microphone: silicon microphone Built-in battery: 3.7V 80 mAh polymer lithium battery * 2 with protection board Charging voltage/current: 5V/60mA Charging time: 2 hours Charging method: TYPE-C port charging Playing time: 7 hours Standby time: 6 months