They have easy connection and that's where their good points end. Once a month they disconnect and you have to set them up again from scratch. I have 8 of these, and by chance a friend gave me another Chinese one, which for a year now I haven't had to touch again — it's always there and working.

Additionally, what an unacceptable price I see today, 11/07/2025! Check the price history — it should be capped at 6 euros!

I bought 2 sensors. The distance from the coordinator is about 5 meters with one wall in between (while the other is close to 10). Both worked normally for about a week. Then they started disconnecting continuously. I got a smart plug that is also a ZigBee router to have a better connection. Even though the signal is okay, I continued to have interruptions. Don't even bother buying them, they are problematic and you can confirm this with a little search in forums.

The battery lasted exactly a year and a half. I think it's fine.
I don't have it far from the zigbee hub, so I don't know what's going on with the signal quality, but I haven't had a single disconnect.
The bad thing is that it didn't report low battery; I saw it at 100% and suddenly it was over.

It should come with its battery. Similar devices from Sonoff in the past had it. As a sensor, it works quite well. One of the more stable ones from Sonoff. The problem is that it needs battery replacement every few months. And it's fine to have 1-2, but when you start filling the house...

I have bought 3 sensors and they work flawlessly. I had a problem with the battery that lasted a little, but I put a Varta prof. and I have been without any problem for 1 month+. I will buy more to fill the house, and I will add that the Zigbee hub is needed for the traps to work

Connected via Sonoff's Zigbee bridge. Minimal battery consumption, fast response in opening and closing. The only downside is that you cannot use it for scenarios and automations through Google Home and the eWelink application

Flawless! No disconnection, immediate update, the consumption and behavior with low battery remains to be seen.

Good product at the right price. It can only be connected through the Sonoff ZBBridge device. It has reliability in notifications and can participate in many scenarios with other Sonoff devices.

Excellent value for money, I have about 4 of them for approximately 2 weeks combined with the aeotec hub (SmartThings), even at a relatively short distance (~5 meters maximum distance with 1 wall in between) and so far they don't seem to have any issues, no disconnections or false alarms, and the battery seems to be fine - it hasn't dropped below 100%.

It actually does what it says.
I've had it for 1 month and the battery is still full!
Immediate response, notifications come instantly and commands from Alexa are executed smoothly and quickly!

Connection with ConBee II Zigbee stick to Home Assistant. No problem so far.
Value for money. Especially now that other well-known brands have exceeded 20 euros

It works with hubitat elevation. Like all ZigBee devices, it requires repeaters. I have had them installed for 11 months and they are all at around 70%. It provides quick feedback to the hub.

Connected seamlessly with the Sonoff ZB Bridge and so far it works perfectly without any disconnections!!!
Update: 19/04/2023
Unfortunately, after almost 1 year of use, I am extremely disappointed with the product!! The battery that came with the sensor lasted for almost 3 months.. All good until this point. However, any battery of any brand that I subsequently installed did not work for more than 1 to 2 days, rendering the product essentially useless. I couldn't find online the cause of the problem and a possible solution... Complete disappointment!! I am changing my rating to 1 star, at best!!

First of all, excited, then disappointed after a few days!
Three out of the six sensors that I bought keep disconnecting even though they are within a distance of 5-10 meters from the ZigBee Hub.

Bad product, I have bought two. One of them never worked. The money was refunded immediately. In conclusion, I do not recommend it. The negative is that I have purchased the Sonoff Hub and I do not know if I have any other option.