Features:
True Wireless Stereo BT5.0:
Wireless dual ear design, you can use the earbuds solely or in pairs. BT 5.0 enables high data transfer speed, stable connection, and low power consumption.
Fast & Easy Paring:
Auto power on and fast pairing between left and right earbuds once taking out from the charging case. Easy and quick to pair with BT-enabled audio devices.
Long Battery Life:
40mAh battery in each earbud offers about 4 hours of music playing time. The earbuds can be charged automatically in the 1200mAh charging box.
Hands-free with Dual Mic:
Built-in dual Mic delivers clearer and more real talking sound in stereo mode. BT5.0 chip enables to grasp the detail of voice greatly.
Battery Digital Display:
LED battery digital display can clearly show the battery allowance of the earbuds and charging box. Charging box can work as a mobile power source to charge mobile devices.
Smart Touch Control:
Touch control design, no more pressure on your ears. Easy to control music, volume and call, and activate voice assistant.

Specifications:
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: 100±3dB
Impedance: 32Ω
Charging Box Capacity: 3.7V 1200mAh
Earphone Battery Capacity: 2 * 3.7V 40mAh
Music Play Time: about 4 hours (depends on music volume)
Waterproof: IPX4
Color: Black, White (Optional)
Earbud Size: approx. 3.5*2.6*2.0cm/1.37*1.02*0.78in
Earbud Weight (Each): 4g/0.14oz
Charging Case Size: approx. 8.2*5.3*3.2cm/3.22*2.08*1.26in
Charging Case Weight: 73g/2.57oz
Package Size: 13.5*10.5*3.5cm/5.31*4.13*1.37in
Package Weight: 130g/4.58oz