Just check coupons out (with price alert and history). What is best price?
Do Not Disturb Mode: yes, Timer: yes, Working environment: 0 – 40 Deg.C, App name: USmart Life, Encryption type: WEP / WPA / WPA2, Input power: 5V / 1A, Working humidity: 10 – 90 percent RH, Battery capacity: 500mAh, Wireless type: WIFI 2.4GHz b / g / n, Download: QR code on user manual, Standby time: 1 year
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):
Price history and price alert
Here is price history (for all/most countries) for Alfawise KD1 WiFi Smart Door Sensor.
Price records source(s): Gearbest
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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)).