Maximum current 16A / 20A (Can be Choosed), Specification EU plug, Network security level WPA/WPA, Wifi type 2.4GHZ 802.11b/g/n, Standby power consumption <0.7W, Application Tuya / Smart life, Working temperature -20°C-50°C, Function Charge statistics, Input voltage 100-240V 50/60HZ, Model BSD33W, Material ABS+PC fireproof material. You can create price alert here, copy coupons and view price history. 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 price update (UTC time):
Banggood
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it?
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): BGSP864, BGGRE864, BGca41ec, BG19563a, BGb4a5bd, ADMITAD2212, BGSmart6, 8Couponsde, MVC8SPRING, 8BGwbg2204, 2203ActiesNL, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGJUNEGSG9, BG8ReviTrage, Cuponation9
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Smatrul BSD33W Tuya Wifi Smart Socket 20A. The lowest price was: $9.66.
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)).