Charging time: about 2h, Battery capacity: 135mAh, Headphone Pads Material: Silicone, Vocalism Principle: Bone Conduction, Waterproof: IPX8, Connectors: Balanced Connection, Color: Black, Sensitivity: 42dB, Playing time: about 6h, With Microphone: Yes, Brand: Lenovo, Support Memory: 8GB, Driver Diameter: 16mm, Impedance Range: up to 32 Ω, Communication: True Wireless, Wireless Type: bluetooth, Frequency Response Range: 20-2000Hz, bluetooth Version: 5.0, Model: X5, Earcups Type: Sealed.
Basically copy coupon, view price history or create e-mail price alert. 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. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG3f1bcd, BG376c91, BG7f4b9ces, BGBuscape01, BGBRPL2, BGHOTSHOP15, BG53e9c8, BGAlerabatKL
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for Lenovo X5 Bone Conduction Bluetooth 5.0 Headphones is here. The lowest price was: $49.99.
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)).