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, Oct 28
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At a glance
- Condition
- New
- Style
- Door Sensor
- Model
- P1DSA2
- Dimensions
- 1.97 x 0.83 x 2.36 in
- Weight
- 2.08 oz
- Material
- Plastic
- Maximum Supply Voltage
- 3 volts_of_direct_current
- In the box
- AAA Battery × 2Door SensorDouble-sided TapeScrews
Features 5
- 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.
Description
Third Reality is dedicated to developing easy-to-use smart home technology, allowing more users to easily manage and automate home devices without specialized skills. Our products emphasize simple installation and user-friendly interfaces. Door and window sensor can directly work with compatible ECHO. You can monitor every door and windows in your home and create routines to send messages to your smartphone when the door or window is open. You also can create routines that are triggered by the on/off status of the door sensor. Safeguard your home when you are on business or vocation, it will automatically push instant notification to your smartphone immediately. In smartphone, you can see the history records of the smart door sensor. Using the Smart Bridge MZ1(Sold separately) and the 3R-Installer App, you can customize the delay time to suit your preferences. Using two AAA standard batteries, the batteries life can last for up to two years and very easy to replace. When you cooking in the kitchen, no more worrying about the baby will slip out of the safety fence. When you enjoy your voaction, no more worrying about someone will break in. No more worrying about parents living alone forgetting or repeating their medication.
Specs 19
| 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 |
| Maximum Supply Voltage | 3 volts_of_direct_current |
| 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 |
| Brand Name | THIRDREALITY |
| Model | P1DSA2 |
| UPC | 850001595285 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Manufacturer | Third Reality, Inc |
| Unit Count | 1 Count |
| Part Number | 3RDS17BZ |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Oct 28
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
I was happy with it, then it went haywire, then it returned to working properly
Style: Door Sensor
Updated review 11/14/22 and reinstated 5 star rating: Apparently, during the last week or so of October 2022, there was a software issue of some sort between this device (contact & motion sensors) and my Echo Show. I think it was a zigbee issue. A lot of users of zigbee-enabled devices complained about it on reddit. I don't know the exact problem because it's all hush-hush, keep the customer uninformed. Apparently, it was corrected by Amazon after approximately one week. My Third Reality zigbee contact and motion sensors all work beautifully at the moment. Until the next glitch, of course. I reinstated my original 5 star rating because I really like how these devices work for me (except for the glitches, of course). ----------------- Updated review 10/31/22 and 1 star rating: It worked great, until it didn’t. It disconnected from Alexa and won’t reconnect. The sensor itself works. The red light lights up when the door is open, but what good is a sensor when Alexa can’t tell you the door is open? ——————— Original review 10/13/22 and original 5 star rating: This device works with my Echo Show with zigbee. I asked Alexa to "find my device" and she did. I didn't need any other hub, app, or skill, and I like that it's not wifi. I purchased a couple to use on interior doors at night so I know if a door opens or not. I set up an Alexa routine. In my house, Alexa announces the door is open within 3 seconds of opening the door. There is no down or recovery time. It'll work again within seconds. I'm very happy with it and its easy integration via zigbee with the Alexa app.
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Reviewed in the United States on October 14, 2022 by 🎉customer
Solid sensor
Style: Door Sensor
This is my second of these door sensors. The first one is on the door to my laundry room and the second is on the door to my walk-in closet. Both are set to turn on the overhead lights to 100 percent brightness with daylight white when the door opens and to shut the lights off when the door closes. Both work correctly. The first sensor has been up for a week and it functions perfectly. The second sensor was simple to program and is working well also. I’ve included a picture. You can see there is a small gap between the two pieces when the door is closed. That’s fine and doesn’t interfere with functionality. I am very pleased with my purchases. They are well worth the price of $20 each which was the price I paid.
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Reviewed in the United States on August 20, 2026 by Whit
Reliable and Easy to Use!
Style: Door Sensor
I added a couple of these THIRDREALITY Zigbee contact sensors to my smart home setup and they work flawlessly. Pairing with Home Assistant was quick and easy, and they respond instantly when a door is opened. The battery life has been great so far, and the build quality feels solid. Perfect for peace of mind and home automation. Highly recommend!
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Reviewed in the United States on August 26, 2025 by travelisthepoint
Works excellent with my HomeSeer system!
Style: Door Sensor
I added this to my HomeSeer system using their free Zigbee Plus plugin. The sensor added easily without an issue. HomeSeer displays the contact value (whether the door is open or closed), the battery level, and the link quality. The link quality is handy as this lets you know if it has a good connection to the hub. I use this on my inside garage door. When I come home and open that door, I have an automation event that turns on the hallway lights. I only turn on the lights if I enter the home, not when I leave. I use a motion sensor in the hallway to detect that I am approaching the door from the inside. The automation will not turn on the lights if motion is detected. Pretty neat. I cannot comment on battery life yet, but it's been a few weeks and it still shows 100%. The sensor is activated multiple times a day. They include double sided tape to attach it to the door and the door jamb. Seems like its staying attached well.
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Reviewed in the United States on July 14, 2023 by RJH
Works great!!!
Style: Door Sensor
Tried them all with SmartThings. THIS ONE, while a bit larger than most, just keeps working. 2 AAA batteries truly lasts a long time. Batteries are also common and cheap. Can't stress that enough. I'm so over those round flat types that last maybe 6 months at best. Due to the molding around the door, there is quite a big gap. But this sensor has no problem at all with that. This is my new go to door sensor for my system.
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Reviewed in the United States on August 7, 2026 by TAB
Will not maintain a connection to Hubitat Hub
Style: Door Sensor
Generally been very happy with Thirdreality products. And I do know what I am doing with an ecosystem of >250 devices built up over the years. But this contact sensor - or, at least the one I got - consistently drops its connection to my Hubitat hub after a day or two. Refreshing, Initializing, rebuilding the Zigbee network do nothing. Have to remove and reinstall batteries to agin get the hub to find it. Tried all the recommended solutions: reboot hub, exclude and then include without wiping hub memory, totally exclude and then include. Still going offline after a day or two.
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Reviewed in the United States on August 23, 2026 by WBS
Solid and versatile product from 3R
Style: Door Sensor
Bought this to use in conjunction with a palm vein smart lock to monitor door status and enable routines. Super easy pairing through Hubitat, and I was able to configure it alongside the lock to lock/unlock based on the status of the sensor AND prevent errant locking when the door was closed and then quickly opened again (HUGE bonus). Don't know about the battery life yet, but I don't anticipate having to change them anytime soon.
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Reviewed in the United States on April 11, 2026 by Jeremy Nichols
Best choice
Style: Door Sensor
Love these sensors. They pair almost instantly and are a great addition for my home assistant setup to automate all my lights. I’m also using them for my own local security system. Definitely the best value out there for sensors. You can’t go wrong with any Thirdreality product.
Reviewed in the United States on January 18, 2026 by SGranger