eufy Security Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional

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Purchase options and add-ons

Color white
Brand eufy Security
Power Source Battery Powered
Compatible Devices Smartphone
Product Dimensions 1.1"L x 0.87"W x 2.91"H

About this item

  • 2-year Battery Life: One battery provides 800 days of monitoring.
  • For Doors And Windows: Compact and versatile design fits onto any door or window frame. Requires eufy Security HomeBase.
  • 100-decibel Siren: Enable or disable siren protection, which triggers a 100-decibel siren on HomeBase, and sends an alert to your smartphone when forced entry is detected.
  • Optional 24/7 Protection Service: New optional 24/7 professional monitoring service is now available for 24/7 emergency police, fire and medical response when your alarm system is triggered.
  • What's Included: Entry Sensor, CR123A Battery, Magnet, 3 x Mounting Screws, Owner's Manual.
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Customer ratings by feature

Easy to install
4.6 4.6
Motion detection
4.5 4.5
Battery life
4.5 4.5
Adhesion
4.3 4.3
See all reviews

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  2. eufy Security

    At eufy Security, privacy and protection are our top priorities. Both are integral to our daily operations, and to implementing measures that ensure your data is always safe.

    From your newborn crying for mom, to your victory dance after a game, your personal moments are yours. We are committed to products and services that keep your data private and secure.

    That’s just the start of our commitment to protect you, your family, and your privacy.

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Product Description

T8900
Secure Made Simple

eufy Alarm System

T8900
Secure Made Simple

eufy Alarm System

T8920

No Monthly Fee

Home Monitoring Service with No Monthly Fee

Meet the Members of eufy Alarm System

1

5-Piece Home Alarm Kit

1

Entry Sensor

1

Motion Sensor

1

Water and Freeze Sensor

1

105 dB Siren

See Details
Customer Reviews
4.3 out of 5 stars
863
4.6 out of 5 stars
1,609
4.4 out of 5 stars
2,298
4.7 out of 5 stars
92
—
Battery Life
2-Year 2-Year 2-Year 2-Year 2-Year
Battery Type
CR123A CR123A CR123A CR123 CR123
Waterproof
No No No IP65 IP65
App Control
✔ ✔ ✔ ✔ ✔
HomeBase Required
✔ ✔ ✔ ✔ ✔

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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eufy Security Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional

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Product guides and documents

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Price$29.99-17% $24.99
New Price: $29.99		$27.99$34.99
Delivery
Get it as soon as Sunday, Jul 14
Get it as soon as Sunday, Jul 14
Get it as soon as Monday, Jul 15
Get it as soon as Sunday, Jul 14
Customer Ratings
4.64.6 out of 5 stars1,609
4.24.2 out of 5 stars81
3.73.7 out of 5 stars37
4.74.7 out of 5 stars92
Easy to install
4.6
4.9
3.6
5.0
Battery life
4.5
4.5
—
5.0
Value for money
4.1
—
3.8
4.6
Motion detection
4.5
4.7
—
—
Sold By
EufyHome
EufyHome
Eezy Life
EufyHome

Important information

Wattage

7 watts

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Customer reviews

4.6 out of 5 stars
4.6 out of 5
1,609 global ratings

Customers say

Customers like the quality, value, and ease of installation of the motion sensor. They mention that it works well, is easy to integrate with the Homebase, and is good value for the price. That said, some complain about the battery life and notifications.

AI-generated from the text of customer reviews

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QualityEase of installationValueNotificationsBattery life
96 customers mention "Quality"82 positive14 negative

Customers like the quality of the alarm. They mention it works well, is reliable, and is of good quality. Some say that the entry sensor triggers the home base alert to let them know when the front door is open.

"...battery life of 2 years, mine still show full battery and work every time without missing a single opening or closing of the doors after nearly 3..." Read more

"...Great security add to any system. Eufy app is easy to manage as well." Read more

"Anything eufy is good quality. I have their cameras and doorbell. Quality is excellent and best of all no monthly fee" Read more

"...base, they were added to the controller app, they have been working perfectly thus far...." Read more

48 customers mention "Ease of installation"48 positive0 negative

Customers find the installation process of the alarm to be easy. They mention that it works perfectly and is easy to integrate with the Homebase. They also say that the door and motion sensors are easy to install and work well. They say that it pairs easily, connects right away in the app, and is value for money.

"Buy these in sale, which adds to their value. Installation and set up is so easy it almost make you think you did it wrong...." Read more

"...3. Installation and setup: Don’t know how it could be easier.4. Interface is easy to use and setup to customize5...." Read more

"...We’ve recently purchased many eufy security products. These sensors pair easily to my eufy homebase 2 and read the door’s open-close status..." Read more

"...It ties in with my other devices. Easy setup and phone activation." Read more

15 customers mention "Value"11 positive4 negative

Customers like the value of the sensor. They mention it's a great sensor for the price and that there's no monthly fee.

"...Quality is excellent and best of all no monthly fee" Read more

"...Eufy is one of the few camera security systems that does NOT require a monthly fee." Read more

"...Too expensive" Read more

"...Who knew security and support could be so reliable AND affordable?! 💕..." Read more

14 customers mention "Notifications"7 positive7 negative

Customers are mixed about the notifications. Some mention that they are very quick and convenient. However, others say that they need work and are very delayed. They also say that the product picks things up late and that you cannot remove notifications when it senses open and closed.

"...Syncing to the home base was simple and fast." Read more

"...Again, it picks things up late in my experience so I have to have it on high sensitivity or it misses obvious things...." Read more

"...Peel and stick. Add to the app then done. Notifications arrive quickly. At a glance in the app I can see if the door is open or closed...." Read more

"...Was unable to turn off notifications from the product page in app; but figure out how eventually.Under “security” tab on bottom..." Read more

28 customers mention "Battery life"7 positive21 negative

Customers are dissatisfied with the battery life of the alarm system. They mention that it stopped working unless they reboot the hub every day, and that it doesn't work for their use case. Some customers also report that the battery provided didn't last long, and two of four sensors stopped working.

"...I was initially weary that the batteries are not replaceable...." Read more

"...However, Because of the software, they seem pretty useless...." Read more

"...4. Interface is easy to use and setup to customize5. Battery on dedicated Cameras - The version 2 camera really did last 6 months before I..." Read more

"...The OEM batteries Eufy ships are very bad ! Change them out and save yourself the aggravation." Read more

Great for safe lock pin
4 Stars
Great for safe lock pin
Well didn't realize it needed home base my fault or not my fault idk. Talk wife into getting door bell to get home base. So now it works I took the inside panel off my safe and installed it on the safes locking pin. So I get notifications If I open, if I close, or if it's left open for a period of time. I'm hoping it will give me some peace of mind with kids.
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Top reviews from the United States

Brian F
5.0 out of 5 stars Exceeded Expectations
Reviewed in the United States on May 6, 2024
Color: whiteVerified Purchase
I bought and installed two of these sensors in January 2021, and haven't thought about them since! I was initially weary that the batteries are not replaceable. However, we open and close our doors at least 10 times a day, and with a promised battery life of 2 years, mine still show full battery and work every time without missing a single opening or closing of the doors after nearly 3 and a half years.
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Dude6229
5.0 out of 5 stars Almost seems too easy to install and use
Reviewed in the United States on April 6, 2024
Color: whiteVerified Purchase
Buy these in sale, which adds to their value. Installation and set up is so easy it almost make you think you did it wrong. Great security add to any system. Eufy app is easy to manage as well.
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Mike Cabral
5.0 out of 5 stars Great product
Reviewed in the United States on May 6, 2024
Color: whiteVerified Purchase
Anything eufy is good quality. I have their cameras and doorbell. Quality is excellent and best of all no monthly fee
One person found this helpful
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Michelle White
4.0 out of 5 stars Entry Sensors work as they should- Full System Review
Reviewed in the United States on February 9, 2021
Color: whiteVerified Purchase
Eufy Security Review

I’ve put a lot of time into researching alarm systems. I used to work for an alarm system company and believe in home managed “smart” systems. Eufy caught my eye after a lot of great reviews on the doorbell. I decided to keep all my sensors and cameras within the same system to keep it easier to manage. After having it for 8 months now: I’ll go over the pros and cons of this system from my experience. My system includes: 2k Wireless Doorbell Cam, Door/window sensors, Motion sensors, Eufycam 2c (wireless) version, Eufy Cam 2, and a 2k Indoor Cam Pan and Tilt. I have been testing most cameras on the highest sensitivity

Pros:
1. Won’t drain your wifi: We have relatively low bandwidth, a decent amount of smart devices, and Eufy works well most of the time! The range is good too I have one camera in the backyard away from the house and it streams well.
2. Local recording: Peace of mind knowing someone at the company or something isn’t watching you.. I hope, haha.
3. Installation and setup: Don’t know how it could be easier.
4. Interface is easy to use and setup to customize
5. Battery on dedicated Cameras - The version 2 camera really did last 6 months before I had to charge it, and I had high sensitivity most of the time. The 2C cameras are good, but not quite as advertised. The doorbell is the worst and I have to charge is about every 2-3 weeks.

Cons:
1.) Motion detection - this is my biggest issue with the system as its part of most of the products use this hardware to trigger alerts or record.

- Detection/reach is NOT 30 feet. I’ve measured on multiple cameras and it rarely picks up anything that far away. Usually starts recording at about 10-15 feet (so half?!). Not great.

- People and dogs? Nope. It will often go off with cars, leafs blowing by, when a cloud moves and the suns sines through brighter than the second before, and more. This can be very frustrating, especially when you have it set to “human only” mode. WHAT HUMAN CAN MOVE 35 mph and is 12 feet long? Or what human is 3 inches big and brown…i.e a leaf? Haha.

- Slow: If someone hurries up to your door or by the camera, it won’t pick it up. I get a lot of recording of back of heads as UPS folks are going away.

-Sometimes misses obvious ones: A family member will walk by a camera 10 ft away in the middle of the day, or go to their car and nothing will have been triggered. Kinda scary. This is especially odd since I’ll get 3 triggers a day from a gust of wind, but not a person walking by… I don’t get it.

2.) False Alarms. This is mostly a product of the motion detection and mentioned above. The scariest in when you have the alarm set to “away” in the middle of the night. The heater turns on in the basement and a “motion detection” alarm goes off. You spring out of your bed… oh crap, someone is in the basement?? Grab a gun, wife runs to grab kids… your adrenaline is running high at 2am and… nothing (thankfully). Have that happen a few times with a camera, or motion sensor and then it becomes a boy who cried wolf situation. Scary when you actually need to be alarmed though you’ve built up a tolerance. But hey, now I’m getting good at “sweeping” an area much like a SWAT team I see in the movies? Haha

3.) Default evening motion detection is set to “all things”. So if cars go by, you’ll have to turn off notifications or else you’ll get a LOT, all night.

4.) Doorbell Battery life: if you want to monitor well, it dies quickly. Again, it picks things up late in my experience so I have to have it on high sensitivity or it misses obvious things. And yes, I’ve tried placing it in different spots.

5.) Image quality not as advertised- for “2k” on some of these cameras, it’s not like the advertisements where you can zoom in and clearly see a license plate or something haha. Faces are pretty good, but it’s not thaaaat great. Better than others for sure, but still not what you’d expect for what seems to be the highest def in the consumer wireless market.

6) Incomplete Security items: These are bonuses, but a fire-alarm, flood sensors, or other items that would make it complete. This includes monitoring service. Would be great to have IF you go away on vacation for a week. I’d pay for it. Lastly, I love that a certain competitor has a cell signal incase wifi goes out.

7) Indoor cam has its own security settings. Why is this separate? Just treat as another 2c, or version 2 camera.

Conclusion: I had high hopes for this system. Other systems seems to be less compatible with google home, or charge money to use the cloud, or don’t locally record, etc…. It seems there is not a perfect complete system. This one is pretty good If I were to do it again I would just use the doorbell and maybe door/window sensors. I then would get the cameras and motion sensors from a different company and hope I can bridge it all to a google home or something.
51 people found this helpful
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N. Hurn
5.0 out of 5 stars Unimpressed at first. But stay tuned!
Reviewed in the United States on December 8, 2019
Color: whiteVerified Purchase
Lots of potential. Hardware is very well designed. Software feels like it’s still under development.
We’ve recently purchased many eufy security products. These sensors pair easily to my eufy homebase 2 and read the door’s open-close status reliability. However, Because of the software, they seem pretty useless.
Right now, I can “arm” my eufy security system and an alarm will sound when the door is opened. That’s good. But the app requires many taps to arm/disarm the system and there’s currently no integration with other systems like HomeKit or August.
I expect one big button to arm/disarm all my smart home security devices.
Adding integrations to arm/disarm the system or Siri Shortcuts would be a big improvement!

Additionally, the sensor has no chime feature with the homebase making it useless unless the system is “Armed”. It would be very useful to hear a pleasant chime from the homebase or the eufy video doorbell chime when my young kids open the door unsupervised.

Ultimately, it’s a neat add-on to my eufy cameras, but features seem a bit raw or missing. I’m hopeful eufy will continue development.

Update: Anker emailed me about my review and apologized for the experience. As part of the apology they sent a cool little battery bank. I’m glad they care and are paying attention. I hope this means they’re adding my requested software changes. Unfortunately for Anker, my review doesn’t change until they change how this product integrates with the rest of the system.

More updates: Anker/eufy has continued to pursue total satisfaction. I must say I’m impressed. If they’re product development work’s nearly as hard as their customer service, they’ll be adding my requested changes in no time. Along with this update I must mention an announcement by eufy at CES 2020. Eufy is releasing a new keypad with home/away buttons thereby satisfying one of my major complaints with this system as an alarm. I am increasing my rating from 3 stars to 5 stars out of optimism for future updates as well as outstanding customer service.

Update 7/8/2020
The requested door chime feature has been added. Now a pleasant chime is made by the hombase2 when a door is opened.
They still lack in integration even among their own products. If I arm the alarm system, (camera, motion, and door sensors paired to the homebase2) other devices like the floodlight cam outside are unaffected and do not switch into an “away” mode without additional action in the app.
103 people found this helpful
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Thosoc
5.0 out of 5 stars Good sensors
Reviewed in the United States on November 28, 2023
Color: whiteVerified Purchase
I purchased a couple of these entry sensors in addition to the Eufy Security 5-Piece Home Alarm Kit, which is equipped with just two sensors. The delivery was promptly and well-packed. These were installed following the installation of the 5-piece kit. Once, installed and synchronized with the home base, they were added to the controller app, they have been working perfectly thus far. The only negative that I can see with these sensors are the magnet housing, where on some porous surface like an unpainted door frame, the sticky pad in the back was not strong enough against the magnetic tendency to pull it toward the sensor, so I tried to keep it in place with the provided screw; however, that did not worked-out satisfactory b/c the plastic base of the housing was not sturdy, the plastic housing is a little flimsy, and the screw head is tiny. So, to fix it, I had to fabricate a little bracket to hold the magnet assembly in place.

Recommendation to Eufy: improve the magnet housing assembly by making it a little wider and sturdier along with a larger screw that is capable of holding it down securely.
5 people found this helpful
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Top reviews from other countries

Ian
5.0 out of 5 stars Solid entry/exit sensor!
Reviewed in Canada on August 16, 2020
Color: whiteVerified Purchase
Another quality Eufy security device. These install easy and work perfect. The response time in my home is 1-2 seconds max. I use one on my main door as an arm and disarm spot and it provides that subscritpion hardware feel in a very smart DIY system.

The considerations here will be related to install location. You have to have the little magnet no more than 4cm from the sensor so you need to make sure your mounting points are close enough together. Do you have thick door trim or a large gap between the door and a solid mounting point? Weird textures or recessed sidelight glass? Consider where you'll put the pieces before you order and especially before you stick or screw them in. 4cm is a good distance and should work for most people.

These make a great addition to my Eufy smart DIY security system.
8 people found this helpful
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Bonnie
5.0 out of 5 stars Real time Garage door status
Reviewed in Canada on February 29, 2024
Color: whiteVerified Purchase
Works well as a continuous monitor of garage door open/close status. Can configure alert if door is opened and is not closed within set time, or open past a set point in time (ie, to ensure it is closed at night)
Can view status at a glance from Eufy home screen Great addition to system
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Bonnie
5.0 out of 5 stars Real time Garage door status
Reviewed in Canada on February 29, 2024
Works well as a continuous monitor of garage door open/close status. Can configure alert if door is opened and is not closed within set time, or open past a set point in time (ie, to ensure it is closed at night)
Can view status at a glance from Eufy home screen Great addition to system
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2 people found this helpful
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Mort Geller
5.0 out of 5 stars Great Product
Reviewed in Canada on January 12, 2024
Color: whiteVerified Purchase
Fast delivery
Easy installation
It works
Have a lot of Eufy products very impressed
One person found this helpful
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Daren L.
4.0 out of 5 stars Works perfect
Reviewed in Canada on May 1, 2024
Color: whiteVerified Purchase
Works great, paired with homebase without issues. I use a command hook two-sided sticky tape so I can remove without damaging the door or paint. Comes with a battery.
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Ramona Strange
5.0 out of 5 stars Great so far
Reviewed in Canada on October 12, 2019
Color: whiteVerified Purchase
Installed these on the doors & ground level windows in a (new to me) house for peace of mind. I currently have a Eufy camera that works with the base station - so these were a no brainer add on. (you need the base station, currently) Simple to install - each piece backed with 3M tape. Easy to add to the app - was able to sync each one within a minute. You can label them as you like, and reorder the list in the app, so you see what you want. Sends notification to app of door open/close in 2 - 30 seconds real time of action. ( in my experience so far.) (I have sirens off.) Specs say battery will last a year. (will be simple to swap out, but those batteries are not the cheapest. ) I've had them approx 2 weeks now, no issues. Definitely recommend, for their function, if you already have a base station to sync to.
6 people found this helpful
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