Charging Box Capacity: 3.7V 1200mAh, Drive Unit: 13mm, Model Number: QT81, Package Weight: 130g/4.58oz, Charging Case Size: approx. 8.3*4.8*3.0cm/3.26*1.89*1.18in, Earbud Weight (Each): 4.0g/0.14oz, Earbud Size: approx. 4.1*1.7*1.6cm/1.61*0.67*0.63in, BT Version: BT 5.0, Brand Name: Lenovo, Earphone Battery Capacity: 2 * 3.7V 40mAh, Waterproof: IPX4, Music Play Time: about 5 hours (depends on music volume), Frequency Range: 20-20KHz, Package Size: 14.0*11.2*3.8cm/5.51*4.41*1.49in, Transmitting Distance: 10m/33ft (no obstacle), Impedance: 32Ω, Sensitivity: 98±3dB, Color: Black / White, Charging Case Weight: 70g/2.47oz.
Just check coupons out (with price alert and history). You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($14.99): BGdc7793
2. ($14.99): BG65130e
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGHU0270, BGQT819, BGQT81BB, BGLOAC1, BGTRYP2, 13f142, BGHU0416, BGH8699, BGb9cdf7, BGAHM869, BGAHM8699, BG44debf, BG904cb6, BG6ee157, BGa0b145, BGbea108, BGUKSSQT, BG168650, BG2ad59a, BG5ee9cd, BG7QT81, BGDLE81, BGf3d8c8, BGbadaa0, BG71411a, BG2541a5, BGf49a16, BGBuscape01, BG4b5202, BGdc3043, BG8b7406, BG37b7f4, BGe8715c, BG4e6f94, BG87d3e0, BGHOTSHOP15, BG5a06bc, BGe4c92f, BGAlerabatKL, BG3115ae, BGbf7e18, BGAudioVideo, BGa827cc, BG66c8ed, BGISLPQ81, BGJPLENER02, BG995d07, BGAUDIO, BGd9977b, BG7243c0, BGaf21d3, BGbbba0c, BGe6b450, BGa3cf03, BGe6050c, BG1a47fe, BGcacf69, BG99597c, BG8c0edb, BG0db70b, BGd92167, BGa7a4a4, BGAudio3, BG11b0be
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Lenovo QT81 TWS Bluetooth 5.0 Earphones. The lowest price was: $11.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).