Door and Window Sensor P2, Matter Over Thread, Requires Thread Border Router, Contact Sensor with Remote Alarm and Local Automation, Supports Apple Home, Google Home, Alexa

I have not had any of the connectivity issues or reliability issues that some reviewers have had with this product. To date I have purchased 7 of these contact sensors, and they have all been rock solid, in fact theyve been some of the most reliable products in my smart home. If that changes I'll edit this review with an update. They all paired to Home Assistant using Matter quickly and without issue...except for one. One was actually giving me a decent amount of trouble with pairing. I ended up temporarily turning off my Wifi's 5Ghz network, factory resetting multiple times, and retrying multiple times, but it did eventually work, and that sensor has not given me any trouble since. The sensors are also pretty fast to update, and while it's a tad bulky for a contact sensor, the trade-off is that i've gotten great battery life out of them so far. I have no complaints

Worked for 10 minutes and then stopped responding. The adhesive was good though. Stayed up and didn't tear up the paint when I removed it the same day. For a door sensor, at least some reliability is required for security so I will look for a better product.

I love the Aqara P2 Door Sensors. They've given me peace of mind that my home is safe when I'm on the go! Even non-techies will find the setup of the P2 Sensor easy to accomplish. A warning to the wise, do not remove the sticky tabs until you understand exactly where on the doors the sensor is to be placed. I thought I had them positioned correctly until I realized I would pull the sensor off if I opened the door. I had to pull both parts of the sensor off my door to reposition them, but since the adhesive side is so sticky, I had to pull hard! They grip so well, that I can see them lasting for a lifetime of use. I've added the Aqara P2 Sensors and a Kasa Switch garage light switch to the home Apple ecosystem. With the two, I was able to create an automation that instantly turned the Kasa switch on when my Aqara P2 door sensor was triggered and turned off the lights 10 minutes later. I was amazed at how fast the Aqara P2 was able to turn on the Kasa light switch! I had to slowly open the door to see if the lights were actually off, otherwise, it looked like the lights were on before I opened the door it was so fast. This and the ability to ask "Siri, turn off the garage lights" is a huge win!

I ordered 6 aqara door sensors after hearing a lot of good things about aqara in general. These sensors use the Matter protocol which requires a Matter hub. For me, my options are Google Nest Hub v2, Hubitat Elevate C8, and Samsung Smartthings. All 3 have Matter and can act as hubs. Some, better than others. Quality-wise, these sensors could be better. Of the initial 6 sensors, 5 setup flawlessly, and 1 refused to pair. I sent it back for a replacement. Another sensor decided to go rogue in it's first 24 hours. It would disappear and reappear on the network. It isn't far from the hub, and after the first 24 hours it stopped its weird behavior and worked correctly. One sensor I tried moving from Google Nest Hub to Hubitat, big mistake. First, I couldn't get the Hubitat to pair with the sensor. For some reason, it could never find it. Then when trying to re-pair it to Google, it would fail. After much screaming, crying, begging and pleading I managed to connect that sensor through Smartthings. What I learned is the provided directions are worthless. Pressing the sensor button a few times and then holding it for about 5 seconds will enter pairing mode. The sensor will respond with a slow flash blue light. If it doesn't pair, press and hold another 5 seconds and the sensor will flash red. I am guessing that is factory reset even though it is undocumented. Then press for 5 more seconds to get to the slow blue flash to try pairing. If that fails, move the sensor next to the Matter hub. Try pairing. If that fails, reboot the hub. I had a problem pairing the replacement sensor that rebooting the Google Nest Max Hub fixed. If that fails, try a different hub, like Smartthings. I hope this helps some of you having pairing issues. Update: For those having trouble getting the P2 contact sensor on Hubitat, here's how to do it with the Google Nest Hub or Max. 1. Factory reset the P2 sensor. 2. Pair it to your Google Nest Hub or Max. 3. Immediately (do not wait), open the sensor on the Google Home app and click the gear icon. 4. Click Linked Matter apps & services. 5. Click Link apps & services. 6. Click Use pairing code. 7. You have 3 minutes to open your Hubitat app, go to Devices, Add a device. 7a. Click Matter. 7b. Enter that code in the Matter setup code box. If you were fast enough it should get recognized by your Hubitat. Good luck!

These are wonderful, but you have to do a few things if you're having issues. I tried connecting one and it was not working at all. So I tried to set up another and the same thing happened. Since both were not working I figured it was something with my network. Turns out my mesh router (Google Nest Wifi Pro) was conflicting with my router (whatever ATT gave me). The ATT router had its WiFi signals enabled for 2.4Ghz and 5Ghz so when the set up was happening, it was picking up both WiFi connections from my phone. I disabled the signals from the ATT router, and they still weren't working, but I wanted to try a third just in case, and it magically connected easily. Since that started working, I wanted to troubleshoot the other two that were still having issues. I figured hat during the setup, the devices remembered the settings so I needed a way to reset them and start fresh. I saw a video from their YouTube account that you can factory reset if you press the button 10 times. Once I did that, both connected easily. I bought 13 of these and never had an issue setting up the other 11 after the network issue / factory reset took place. They are easy to set up and don't get in the way. Finally I used the extra magnets that came with each device on my fridge, lol.

tl;dr: I have 5 of these connected to HomeAssistant. 3 work flawlessly - the other 2 constantly fall off. In theory, these are great. I really like the idea of Matter and Thread as a manufacturer independent standard. Sure, commissioning devices is laughably slow and complicated compared to ZWave or (blech) Zigbee, and sometimes randomly fails... I have a degree in networking and can handle that. But where it all falls apart is reliability. For no reason, after a few days or weeks, 2 of my sensors (one of which is in spitting distance to the router) routinely disappear. Sometimes they reconnect on their own, sometimes I have to push the button to get them to reconnect, sometimes they won't reconnect unless I take the battery out and replace it. The 3 others work fine, as do Thread devices from Eve, so presumably this is a hardware QC issue and not a design issue with this sensor or Matter/Thread in general. Can't recommend them for anything that needs to be reliable, like an alarm system.

First, the good - these are pretty nice, reasonably economical door and window sensors. Not the cheapest, not the most expensive. While a bit large and clunky, they're still attractive reasonably unobtrusive. Another nice feature is the distance from the sensor to the magnet that registers as "closed" is quite long compared to many sensors. That's a big deal because if you have trim around your doors, for example, you can mount the sensor on the trim and the magnet on the door and it will still work. With other brands, it simply won't work at all, or they include spacers you have to stack up until they are close enough in an ugly, kinda hack-ey way. Aqara's way is better. They also pair pretty easily, report excellent signal no matter how far from a Thread router they are in my (admittedly not very large) house, and the ones that work properly have worked every single time without a single failure or "no response" issue. I'm quite happy with their performance. Now, the not so good. I bought five of them. I am using Apple Home (HomeKit) via Matter over Thread. Three of them work great. Two of them drain the battery in under two weeks. Replacing the batteries, removing then re-adding to Home, factory resetting then re-adding to Home, and even moving them right next to the active hub/thread border router (an AppleTV 4K) doesn't fix them. Their signal strength reports excellent. They are connected to only one thread network, only one Thread router (just like the working ones, some of which are further from the router), it's winter here so they're not even being cycled. They just suck the battery dry. So there's one more thing I could try - a firmware update. And that's a problem. There is newer firmware available, but you cannot update the firmware via HomeKit. Since I have no Aqara hub I cannot update them. This is admittedly my fault. If you read the description carefully, it says an Aqara Matter Controller/Thread Border Router is required. However, since my other thread/matter devices all update fine through HomeKit, I just assumed these would too. I thought it was part of the Matter standard. No hub is one of the big selling points of Matter over Thread devices. I figured the hub requirement was just for additional features or something I didn't care about, like renaming the device or something. But apparently while it is possible to make updates available in Matter/HomeKit, it is not required to meet the standard. I need to be able to install updates. As these work on firmware 1.0.1.1, in my setup, I cannot. Since I can find no indication on the Aqara web site or any other source indicating that's a known fix for this battery drain issue, it's a roll of the dice to buy a device that serves no other purpose for me. I also started to sign up for an Aqara account to get support through that avenue, but when it asked for my birthday that was it for me. Maybe they would replace it under warranty, but then I'd have 5 devices I can't update without buying more hardware instead of three. Not sure that's even worth it. I gave up. I'm going to cut my losses. If you already have an Aqara hub (many of their cams are also hubs I think) or are willing to buy one, or if you don't mind the return hassle, or if my 66% failure rate isn't typical, or if you just don't care if you can update the firmware, these may be great for you. As I said, the ones that are working do work very well. Perhaps, if it is just firmware, by the time you read this they may be shipping with an update and work fine (or maybe even with updates enabled?) via HomeKit alone without the hub. If so, these are probably worth trying. For me, I think I'll just chalk it up to a learning experience and move on. I've already tossed the packaging (stupid of me), so I won't bother trying to return them to Amazon. Plus, they may not be defective. They may just need an update that I'm not willing to do. I'm just going to toss the bad ones, plan to phase out the others eventually. There are plenty of door and window sensors that work and can be update via HomeKit so this brand will probably be pretty low on my list for any home automation devices in the future. It's too bad, because the G100 camera is an absolute monster value that is just about impossible to beat, and requires no hub to work. If you need a cam (indoors or out!) you may still want to check it out. But the inconsistency between these two products, even though partially my fault for misinterpreting the hub requirement, gives me lingering doubts that will be difficult for me to overlook. So let's call it three stars - one added for every one that works and works well, and one subtracted for every one that doesn't.

Getting my Openthreads border router setup in Docker to use this was a real pain in the... you know, but so far this sensor has been great. It reliably detects when the door is closed or open. They include an extra magnet in case the little white cylinder shaped one won't work, like with a sliding cabinet. Pro tip for the included adhesive: If you do need to relocate this, remove it slowly, lifting form a corner. Then you can clean the adhesive with alcohol to renew it. I was able to restick mine fine in another location without applying new adhesive. I think these get poor reviews because Matter had a rough start, and it's not always as straightforward as Zigbee or other solutions, but after getting this going it's been solid. I've had it going a couple of weeks and the battery is still at 100%, but that could be lack of calibration for to full voltage. I'll try and report back if it becomes an issue.