1.Model Number: Lenovo XT83 Pro
2.BT Version: 5.1
3.Transmitting Distance: up to 10m (no obstacle)
4.Drive Diameter: 10mm
5.Frequency Range: 20-20KHz
6.Sensitivity: 102dB
7.Impedance: 32Ω
8.Charging Case Battery Capacity: 3.7V 250mAh
9.Earbuds Battery Capacity (Each): 3.7V 25mAh
10.Music Play Time: about 3 hours (depends on music volume)
11.Earbuds Charging Time: about 1 hour
12.Charging Box Charging Time: about 2 hours