Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
with voice
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($18.80): CouponsdePC
2. ($19.43): Terence
3. ($19.43): 2203ActiesNL
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): bGhOnEy10, 13f142, BGCuponation10, BANGGOODSD, BGef96eb, Kortings10, 2022ACTIESNL, Tabby20
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for G20S Pro Air Mouse Voice Remote Control.
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)).