THIRDREALITY Zigbee Contact Sensor 4 Pack, Door and Window Monitor, Home Automation,Works with Home Assistant,SmartThings,Aeotec,Homey,Hubitat or Echo Devices with Build-in Zigbee Hub,hub Required

These are great door/window sensors that have been super reliable for me so far. I was tired of a few other brands falling off my Zigbee network, so I went to trusty ThirdReality and haven't been disappointed. They are a bit bigger than alternatives, but that's because they pack a couple of AAA batteries which I expect to last a long time (given their record with other Zigbee devices). It's been several weeks and no battery issues so far; I would guess they'll last months or even years depending on usage. ThirdReality is also a Home Assistant partner, which means they actually test their stuff with Home Assistant and ZHA for their Zigbee stuff. It's perfectly compatible with my Sonoff Zigbee radio, as well as the Home Assistant ZBT-2 I recently switched to. They're a bit on the large size and not particularly pretty, but I don't think you could find a more reliable contact sensor for doors or windows (or drawers, or car chargers, or toilet lids… whatever you freaks are automating!) or a better value anywhere else. If you have the physical space, I'd highly recommend them!

Cheap, simple, and functional. They pair easily to home assistant and are very responsive.

It’s been working as a mailbox sensor without any issues. This replaced my Wyze sensor that was in the mailbox. Now I have better home integration flexibility with Home Assistant. Armed for the mailbox bandit to strike again.

I purchased these to help with various automations around the house including turning lights on and off, warning if freezer/refrigerator doors are left open, etc. and they work perfectly with my Home Assistant setup. The devices were instantly recognized by my Sonoff Zigbee 3.0 USB Dongle Plus (connected to my Pi5 running Home Assistant) and I could setup everything from there. So far, zero complaints as they work like a charm. For those folks frustrated with the mounting tape included with these such that upon removal the devices can crack, I simply used 3M Command Damage-Free Hanging Strips to make moving them super easy. Attached is a picture of the one I have installed atop the inside of my pantry door. I moved it from one spot to another using the Command strip and it came off damage free.

Functionally, these sensors are great. Just be aware they’re a bit fragile and really not designed to be removed once installed. The magnet portion, in particular, can crack if you take it off after mounting—I had to repaint my doors and removed three of them, and all three ended up with small cracks. Nothing a little super glue couldn’t fix, but still worth noting. After reinstalling, the gap between the magnets and the sensor ended up slightly too large, so the sensors occasionally reported the door as open even when it was fully shut. I resolved this by 3D-printing small risers shaped like the original magnet housing, and that fixed the issue. Despite these quirks, I’m still giving them five stars because I’ve had zero technical issues. They work reliably and do exactly what they should. Just know going in that they aren’t really meant to be reused. You’ve been warned.

Don't waste your money, or your time, on Third Reality products. No range, disconnect frequently, and chews up battery life. They're all just useless products. I bought several different sensors. Motion and contact. Difficult to pair, and then disconnect often. Seriously, just find a different product manufacturer.

Overall I’m pleased with these sensors. I like that they use AAA batteries Compatibility is fine - I haven’t had any issues with their connectivity (I use a mix of Zigbee vendor devices off a Sonoff Zigbee dongle). Detection range of the magnet is OK, but can be a little tight depending on this next factor: Something that is very strange about them is that the two parts of the sensor are not the same thickness. The main body is quite a bit thicker than the small magnet. This means that if you mount them on a level surface, they will not be level with each other! Depending on your situation, this can affect detection. A strange choice, but not a deal breaker for my use cases.

Great value for the money, and the simple AAA batteries (included) and long battery life make this a nice low maintenance way to keep track of if a door/window is open or closed. Unlike the Aeotec/Smart Things sensors, this does NOT track tilt/temperature/vibration, but on the flip side, the battery will last FAR longer then that sensor, and it doesn't use annoying coin based batteries which are far more expensive. Like everything made by this brand, it pairs into home assistant extremely easily and it 'just works'.

I’ve been using these door/window contact sensors around the house for a few months now, and they’ve been great. I set them up to turn on cupboard lights when doors open, and to automatically turn on the hallway lights when the front door is opened at night. Once paired with my Zigbee setup (I’m running them through Home Assistant), the automations fire reliably and consistently, no lag or missed triggers. Installation was straightforward: the sensors are slim, powered by standard AAA batteries with up to ~2 years of life, and can be mounted with either the included adhesive tape or screws. Once connected they’ve stayed paired without any problems, and using regular batteries (rather than coin cells) makes swapping them out simple when needed. Overall these contact sensors have worked exactly as I’d hoped. They’re reliable, great value, easy to integrate into automations, and now a core part of my smart-home setup.

Nutze die Sensoren in Verbindung mit ioBroker/NodeRed. Funktionieren einwandfrei, unauffällige Optik.

Ottimo articolo perfettamente supportato da Zigbee2MQTT per Home Assistant, il sensore del campo magnetico consente di avere una distanza considerevole tra il sensore ed il magnete, il che lo rende perfetto per finestre e porte dove la chiusura non è a filo. Funziona con batterie AAA rendendolo compatibile con comuni batterie ricaricabili e sembra consumare veramente poca batteria una volta installato. Ha inoltre un led che si accende quando lo stato cambia da aperto a chiuso, per segnalare il rilevamento. Fornito con due batterie alcaline AAA, viti per montatura e nastro biadesivo già correttamente tagliato sulla forma dei due componenti (non applicato, quindi se lo volete montare con le viti non serve rimuovere il nastro adesivo). Possibili miglioramenti: Supporto opzionale di Matter over Thread, evitare le batterie integrate in confezione per un prezzo dell'articolo inferiore (così chi vuole compra e/o usa le ricaricabili risparmiando qualcosina).

The contact sensor basically works just like any other in the market, and it does work fine and no disconnected devices since I started using them before last summer. But I bought this product basically because of the AAA battery. The AAA batteries are much cheaper to run compared to lithium batteries (CR2 / CR123 / CR2032 / CR2025 / CR2045) and the price of the product itself is very reasonable (during a sale). I've yet to see exactly how long the battery lasts but I had one of them outdoor (subject to temperature range from -15 to +30 degrees) and there is no issue so far.

Perfect for Home assistant and the status is updated without any delay.