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

The Eufy ecosystem is very good, I’ve had it for five years now. Just needed more entry sensors which was easy to synchronize or connect to the WiFi and the system and it works well. The adhesive is good, it sticks properly to the surface of my window really good. I would recommend the entire Eufy ecosystem if you want a reliable security system for your home. Remember you can set up the entire system yourself. It’s that easy.

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.

This is the second unit that I have bought. The first was about 4 years ago probably when eufy first brought it out. I was pleased with it then and am still. The device has proven to be completely reliable. I decided to alarm the my outside garage door which is used by service personnel on a regular basis. Mounting the two pieces was easy using the applied sticky pads. The sensor/transmitter per the instructions can be attached with screws. The two pieces can be installed on any standard and patio doors. The audio alert can be heard throughout my house as the volume and signal can be set in the app. The eufy home base and app allows me to receive notices on my phone when away. The sensor/transmitter uses a not so common battery that is said to last 8 months. I've changed the battery in my original unit once in 4 years. I've installed another manufacturer's door and window sensors in another house. The unit is much smaller and uses 2032 batteries that in my experience don't seem to last as long as the eufy battery. On a door the eufy size is not a problem. I can recommend it as I just bought my third unit.

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.

I purchased 8 of Eufy cameras E30 First one was 2, then set of 4 and the last 2 a few days ago. All of them work so well. They’re better than S340 which is more expensive. However, one of the e30 cam has worked well for a few weeks. Then suddenly the camera battery wouldn’t keep the charge anymore. I had to purchase a separate solar panel to connect to this cam. It still wouldn’t charge well. This cam was purchased in a set of 4. I can’t return it just one unit but have to get all 4 down. Don’t know what to do with it! Hope the seller can help.

Was easy to add to the system. Remember that however you place it, you'll need to be able to pry the cover off to replace the battery while it's in place. Expected life about three years for the battery. Also, before you peel and stick, a good idea to place it temporarily with masking tape, and open and close the door to check operation and clearance. One last thing that might help, if you are far from your WiFi source, check the operation for enough signal strength before mounting permanently. I used my cell phone to make sure I had enough bars for a decent signal before I made the commitment to mount it.

Every product from Eufy I have purchased has been well worth it!!! Highly recommend! With getting these although it is a very simple product the app allows for highly customizable situations. Take for example the night/sleep mode you can customize it to set an alarm if a door is opened after a certain time and they are supposed to be super loud (or I guess you could have the homebase setoff). Haven't attempted this setting yet with my neighbors... Overall fantastic product! I will say I am interested on how much the batteries cost that go inside these as they are very specific. Would buy and recommend to anyone in the Eufy ecosystem!!

Nice companion to my eufy cams

An all-round great product, set up was easy, and they are super reliable. I just took them out of the box, loaded the included batteries into them, and placed them on my door and door trim, and it worked like a charm. The adhesive strip on the back of them allows you to readjust the sensor and magnet a few times without losing any strength, so you can find the best spot to place them, making sure the gap between them is less than 4cm. When testing, I armed the security system and opened the door as if I were an intruder, and the alarms started blaring instantly. I also got a notification on my phone as soon as it happened. No regrets adding this to my security system

Handy, easy to install and add to the app, lots of options for notifications so they don’t annoy you. Would repurchase and recommend

It'd be Great if it could support Apple Homekit.

It works well overall, but I have one suggestion: I would recommend attaching the larger part that holds the battery to the wall instead of the door. If it's attached to the door, which opens and closes, the cover plate may eventually pop off and fall to the ground.

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.