Brand Name: Lenovo
Model Number: QT81
BT Version: BT 5.0
Transmitting Distance: 10m/33ft (no obstacle)
Drive Unit: 13mm
Frequency Range: 20-20KHz
Sensitivity: 98±3dB
Impedance: 32Ω
Charging Box Capacity: 3.7V 1200mAh
Earphone Battery Capacity: 2 * 3.7V 40mAh
Music Play Time: about 5 hours (depends on music volume)
Waterproof: IPX4
Color: Black, White
Earbud Size: approx. 4.1*1.7*1.6cm/1.61*0.67*0.63in
Earbud Weight (Each): 4.0g/0.14oz
Charging Case Size: approx. 8.3*4.8*3.0cm/3.26*1.89*1.18in
Charging Case Weight: 70g/2.47oz
Package Size: 14.0*11.2*3.8cm/5.51*4.41*1.49in
Package Weight: 130g/4.58oz