Bluetooth Version：5.1    

Chipset: JL6973    

Frequency range:2.4-2.48GHz    

Transmission distance:Up to 10m    

Frequency response:20Hz-20KHz    

Playing time:about 5 hrs    

battery capacity: 30mAh*2    

battery case capacity:300mAh    

charging times:about 3 times    

charging time: 1.5-2 hrs    

standby time：180 hrs