$10.99 – Wifi Tuya Smart Smoke Detector Sensor 80DB Alarm Fire Smoke Detector Wifi Fire Protection Home Security Alarm Smart Life APP.
I have checked all old coupons and price is $10.99 for Wifi Tuya Smart Smoke Detector Sensor (in Banggood). Just check coupons out (with price alert and history). What is best price?
Latest coupon and price update (UTC):
Banggood ($10.99)
Banggood warehouse is located in China. Is it a low price? Well, according to CouponsFromChina database this price is the best in history (4 records). There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Price without coupon: $12.99
1. ($10.99): BGEUYANWU
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
This is the best price ever noted in my database!
Old coupons (from the oldest to the newest): BG589b2e
(there’s a little possibility that old coupon will work)
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.
Price history and price alert
Here is price history (for all/most countries) for Wifi Tuya Smart Smoke Detector Sensor. The lowest price was: $10.99.
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)).