You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Wi-Fi Frequency 2.4GHz (Not Support 5G WIFI), Maximum Install Gap 20mm, Model DG-ZXD21, APP Name Digoo life, Operation Temperature 0~55℃, Power Supply AAA Batteryx2, Consumption <1uA@standby, Wi-Fi Protocol IEEE 802.11/b/g/n
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 code price check (UTC time):
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
1. ($4.84): BGSMOFF
just apply this code 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): BGZXD21, BGaDmITAd, BGDGZXD21, BGDigoo15%, BGBFCR01, aff7off, bGpAnDacHeCk, 2020CNY, BGVDay10%off, BGZXD211, BGSAMH, 20%DG422, BGDGDSG, BGSM15
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for DIGOO DG-ZXD21 WIFI Door Window Sensor.
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)).