THIRDREALITY Zigbee Contact Sensor, Door and Window Monitor, Home Automation, Works with Home Assistant, SmartThings, Aeotec, Homey, Hubitat or Echo Devices with Build-in Zigbee Hub,hub Required
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Availability:
In Stock.
Arrives
Wednesday, Apr 15
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Style: Door Sensor
Features
- ZIGBEE STANDARD COMPATIBLE DOOR SENSOR: Works with compatible Zigbee hubs or Echo devices with Zigbee hub built-in. Such as Echo (4th Gen), Echo Plus (1st Gen and 2nd Gen), Echo Show 8 Gen3, Echo Show 10 (Gen2 and Gen3).Echo Studio, Eero 6, Eero Pro 6, Home Assistant, SmartThings 2015/2018, Aeotec, Hubitat, Homey Bridge, Homey Pro, Third reality Hub and Third Reality Smart Bridge.
- HASSLE-FREE SETUP: Installs in a few seconds. Just make sure device in paring mode and compatible Echo device automatically discovers it by saying Alexa, discover devices.
- SUIT FOR MOSTLY DOORS AND WINDOWS OF THE HOUSE AND 2-YEARS LONG BATTERY LIFE: Door Sensor uses two AAA 1.5V Alkaline batteries for power, the batteries can last for up to 2 years and it is very easy to replace them. Note: Indoor use only and do not install the Door Sensor on metal door or window.
- MORE FUN WITH ALEXA ROUTINES: Using the Alexa app, create your own routines that are triggered When door or window is open, turn on a light, send an alert to your phone, let Alexa make a voice alarm or make a joke, etc.
- UPGRADED THIRD REALITY APP AND SKILL FUNCTIONS: Connected with Third Reality Hub/Speaker, you can check the battery level in the APP, then replace the batteries in time; history record is also open to the users, so you can know when the state of the movement has been detected and deal with it in time. Enabled Third Reality Skill in the Alexa APP, you will have a low battery warning by emails.
Brand: THIRDREALITY
Item dimensions L x W x H: 1.97 x 0.83 x 2.36 inches
Material: Plastic
Item Weight: 2.08 Ounces
Style: Door Sensor
Mounting Type: Door Mount
Output Type: Push Button
Material Type: Plastic
Style Name: Door Sensor
Item Dimensions: 1.97 x 0.83 x 2.36 inches
Item Weight: 2.08 Ounces
Brand Name: THIRDREALITY
Model: P1DSA2
UPC: 850001595285
Manufacturer: Third Reality, Inc
Included Components: AAA Battery × 2, Door Sensor, Double-sided Tape, Screws
Unit Count: 1.0 Count
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Apr 15
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: Door Sensor 4 Pack
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!
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Reviewed in the United States on January 12, 2026 by Cassidy
Style: Door Sensor 4 Pack
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.
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Reviewed in the United States on December 14, 2025 by Scotchpb
Style: Door Sensor
SIZE: Smaller than expected, it was described in millimeters, and the conversion just didn't work in my head (30mm = 1.1811inches)??? Now I can carry it with me and see what it fits into. SETUP: It was easy to connect to the Samsung SmartThings app. It reports actions very quickly, like within a few seconds, versus Wyze, which took at least 10 seconds. PLAN: Now need a way to make it waterproof so it can be used on the mailbox. The goal is to replace the Wyze contact sensor, which gave me a notification that the mailbox had been opened when mail was delivered.
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Reviewed in the United States on January 11, 2026 by CasSandra
Style: Door Sensor
Works well most of the time. Occasionally, it will not function, but still worth it. Good sensor if you have it in cold weather as it uses alkaline batteries instead of lithium ion. I have mine in my garage mounted to my attic ladder to turn the lights on when opened.
Reviewed in the United States on December 31, 2025 by NHAlpine
Style: Door Sensor 4 Pack
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'.
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Reviewed in the United States on February 17, 2026 by Matt E
Style: Door Sensor 2 Pack
These are GREAT sensors so far. Had them installed for about two weeks now and zero issues. The install and integration to my Smarthings environment was easy. In fact, these were the simplest devices to find and add to the n/w I’ve ever experienced - normally I have to stand on my head, face north and contact some spiritual being to add sensors 😜 One other functional item I’ll note is the distance between the two parts can be fairly large, like over an inch, and still work. There’s an embedded LED in the receiver that lights when the transmitter (magnet) is sensed, which is super helpful when installing and checking functionality. Anyhow, I’m planning to buy more!
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Reviewed in the United States on December 10, 2025 by Andrew
Style: Door Sensor 2 Pack
There’s nothing I love more than spending hours at a time on Friday night trying to understand how to connect devices to my 87 different ecosystems that for some unknown reason aren’t compatible with one another. Between SmartThings, Apple home, Aqara and Alexa you’d think that a stupid matter compatible device such as this would work. But in order for that to happen I’d need a matter qr code which these don’t have… I consider myself quite tech savvy but I’m just about done spending my free time trying to get these stupid things to work. That includes Aqara, Apple home and SmartThings which can all choke for all I care. I was able to get Alexa to work in the past but it’s not as if that was easy either. Waste of money, not compatible, inaccurate and frustrating. I hate this and all other smart home devices and I’m done spending my time trying to figure this out. I’d rather have a dumb home and protect myself with my small Louisville slugger as my security system.
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Reviewed in the United States on March 7, 2026 by JLS1727