Input: 5 V⎓1 A, Carbon Dioxide Range: 400 ~ 5000 ppm [±(50ppm + 5%)], Temperature Range: -10°C ~ 40°C (±2℃) / 14℉ ~ 104℉ (±3.6℉), Power Supply: Built-in Lithium Battery (2400mAh), Product Size: 98 × 90 × 40 mm, Humidity Range: 20 ~ 80 % RH (±5 % RH), Wireless Connection: Wi-Fi (only for 2.4GHz Wi-Fi network).
Just check coupons out (with price alert and history). What is 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 and price update (UTC):
Banggood
Banggood warehouse is located in China. There is no active coupon in my database right now (for 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!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): Cuponation9, BG8ReviTrage, BGcoupon8off, BGGutscheine, BG8OFFCOUPON, TTBLACK5, BGecf31f, BGb68b3e
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for MoesHouse WiFi Tuya Smart CO2 Detector Temperature Humidity? There we go. The lowest price was: $25.99.
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)).