Product Name: Lenovo True Wireless Bluetooth Earbuds HT38
Bluetooth Version: 5.0
Frequency Responses Range: 20 Hz-20K Hz
Speaker Sensitivity: 100±3db
Wireless Propagation Distance: Approximately 10m
Charging Time: about 1hour
Battery Capacity: Earbuds 30 mah, Charging bin 250mAH
Play Time:  Approximately 3 hours
Half in ear, comfortable to wear
Comfortable lightweight portability