Meross Smart Door & Window Sensor, Hub Required, Mini Door Detector Compatible with Apple HomeKit, Alexa, SmartThings, Wireless Sensor Burglar Alert for Home Automation, 328ft Range for Kid Safety

Easy install, Great Connectivity to Alexa
I own several Meross smart plugs and a garage door opener, and those work flawlessly. I expected nothing less from this Door/Window sensor. Meross did not disappoint. Installation was easy (no tools needed) and with the Meross App, once it connected to my home network Alexa immediately found the unit and added it to my device list. I was then able to create routines that would have Alexa announce every time the door opened and again when it closed. You can create routines that meet your needs (turn lights on, start appliances, etc.). This is compatible with Apple HomeKit, Alexa and SmartThings.For this unit, the Meross App will show the current status of the door (opened or closed).I placed this unit on the service door to my garage. This door is probably the most vulnerable as it is hidden from the street and not direct line of sight visible when entering the garage from the house. We now know, with certainty, whether the door is open or closed when we go to bed at night. We will also get a verbal notification should the door be opened at any point in time.The included HUB can control up to 16 Meross devices, so it could handle a house full of sensors.5 STARS AND I DO RECOMMEND THIS ITEMI write honest reviews based on real life experience with each item to help others make informed purchases. I read reviews too, and appreciate how helpful they can be. I hope that you find this review helpful.

These are really pretty bad! Buy knowing what to expect… NOT MUCH – HIT AND MISS!
UPDATED REVIEW – The hubs have been working pretty well now for a few weeks. Meross replaced 2 apparently defective sensors, and I now have a total of 2 hubs and 6 sensors which are “up” 90% of the time, when they go down it is mostly me making changes on my router.I am now pretty confident in them.ORIGINAL REVIEW -I bought 2 kits with the hub included and 2 more with just the sensors. They are all pretty unreliable.The good:1. The hubs and sensors are small and unobtrusive.The bad:1. The battery tray / holder / slot is too loose. The batteries will slide around / move if you have this part of the setup mounted on a door that is opening and closing. Battery will move and unit will lose power. I suppose it would happen less if this part of the sensor was mounted on the door frame or windowsill and not on the part that is moving. I tried using Scotch tape to hold the battery in place, it helps some but not enough. Other reviewers have said they turned the sensor upside down so the battery dose not slide down, this might work, you need to play with the setup. The sensor that contains the battery is one part of the equation, the other part is just a magnet in another piece of plastic.2. The “hub” constantly looses connection to WiFi. I have something like 52 devices connected to my network, quite a few of them are Meross devices, but these hubs are very delicate / sensitive / garbage?In summary, the idea is nice I own quite a few Meross devices, but these are not reliable, especially taking into consideration they are meant to notify you if doors or windows are open. it’s much different than an ambient light not responding.

Easy to install… can be finicky
Easy to install and setup. Has a good 2 second lag which isn’t the best but it’s okay. Day one it completely dropped off the hub and I couldn’t figure out why. I had to take the battery out and replace it very carefully to get it to power back on. After a few more hours it stopped working again and I had to do the same thing, however, this time I mounted it horizontally to the top of a door frame to stop any shifting and it’s been working so far (I think I’m at day 4?). If it goes out again I’ll update this review.