Bluetooth solution JLBluetooth version: Bluetooth V5 .0Battery: 200mAH 3.7V (Lithium Cell)Support range: 2.402-2.480GHzSpeaker diameter:40 mm (4083) Speaker impedance: 3292Working distance: 10m Sensitivity: 118+3dBFrequence respoese: 20-20KHZ Working time: 5 hoursFunction calling, listen...