It does its job very well. It only needs to be connected to a Xiaomi camera if you have one, or a Xiaomi hub, because it is Bluetooth. It needs to be connected to one of the two devices to become Wi-Fi so you can monitor it wherever you are.

Package opened.

Plastic film to prevent battery activation removed. The battery was active and was almost empty.

Extra material needs to be placed between the battery and the device casing so that it presses the battery harder to work.

Magnet incredibly weak. I can't explain it.

I have bought 8 others without any problem.

Connected easily with the hub. Easy setup. I would like better sound from the hub, but that does not concern the sensor.

I highly recommend it!!! I have bought many pieces of this sensor and it really works like a charm!!

It works just fine as advertised. Fewer features than the previous hub from the same company, but on the plus side, the door sensor recognizes light intensity.

Reliable and with very good range. Bluetooth is much better than ZigBee, which disconnects and requires pairing with specific hubs

A little bulkier than I expected. I have an older version that has a significant difference in volume. Overall they do what they say, respond promptly. I have them connected to the Bluetooth hub. I have placed them on aluminum and they work with the recall as well.

Effective, functional, connects with Mi Home, sends notifications when the door or window remains open or in automation

Very reliable sensor and in combination with the xiaomi hub 2, you can create various scenarios with other smart devices as well as receive instant notifications on your mobile when the door opens where you have placed it!

It does what it says in the description, it only works with a hub, I also have the app, so the connection was very easy. It connected quickly, I had no issues. So far, no complaints.

It does not work like the older door sensors. It only connects to other Mi devices that have Bluetooth functionality and cannot perform scenes such as triggering the hub alarm when opened. I made a mistake as I read about these limitations afterwards.

Personal oversight but I thought that Bluetooth was an extra feature, not the only way of connection. In other words, if you don't have a hub, it's slightly useless.

Of all the traps in the Xiaomi ecosystem, etc., this is the best. It connected directly without any delay to any hub I tried. It integrates perfectly into the mi home alarm system. It works on both European and Chinese servers (very important).
Compared to the classic Xiaomi traps (like a pill) and the Aqara traps I have purchased, the only difference is the response time of the event (much faster) and it also has a default function where it sends a notification after X minutes that you can set when a door, for example, is opened.
It is not as big as it appears in the photo, it is quite discreet but definitely noticeable and larger compared to the Aqara and the old Xiaomi traps.
Quality upgrade. If I also consider its price, which is very low compared to Aqara products (I really can't understand why...), it is a very good purchase. Speaking of traps, it is the best purchase for products that work with mi home.

Connected immediately to Mi Home. Its notifications come instantly. It also detects the light intensity in the environment

Very good connectivity and response. Real-time notification as soon as the door opens or closes. I use it with the smart hub 2

Unfortunately, it only connects via Bluetooth, so the alarm itself is useless. You need to buy an extra device to connect to wifi

As a good product, but useless since the Xiaomi application has not been working for almost a month, resulting in it not being able to be utilized in anything!

It works via BT and it's good to have a hub to collect the measurements. It works correctly and quickly. I use the mi hub 2 (gateway 3) and I don't experience any delays. It works instantly

It works correctly and reliably. Depending on the settings you have made, you receive notifications about when and for how long your door has been left open. If you combine it with a hub and other Xiaomi products, you can create smart scenarios, for example, turning on the lights when the door opens.

I went and wasted my money, these connect via Bluetooth while everything else, especially the hub-alarm, connects via zogbee connection

Easy to install and just as reliable as the previous model... the added bonus is the Bluetooth it has, but it requires a different hub than the Mi Smart Home Hub.

With mi hub 3, there are delays in the status indication, while when connected directly to the mobile, the change is more immediate. My Alexa does not recognize it as a sensor, and this is a big drawback. (Note that I also have mi door sensors and aqara, which are ZigBee and are recognized normally, and their status change is more immediate.)
Game sensor...

It works as it should. With connection to Xiaomi's smart hub, you receive immediate notifications for the opening of a door or a window, and it easily integrates with other Xiaomi products for automation, notifications, or alarms. At this price, it is a one-way street.

Upd.: I have connected a total of 8 in my house without any problems. Even in remote rooms with multiple walls in between, their connection to the hub and their functionality is flawless.

New capabilities from the smart sensor of Xiaomi, as soon as it detects darkness in the environment, it turns on the smart lights of Xiaomi... You can even programmatically create smart scenes!

It connects easily. The Xiaomi app seems very user-friendly to me. I am satisfied and I recommend it as a product. I have had it for 3 months and it hasn't presented any issues. I want to see what the battery life is and how I will be notified when it reaches a low level.