Review on Smart WiFi Door and Window Sensors - White, No Hub Needed, Wireless Design, Instant Alerts, 2.4 GHz Wi-Fi Required, Alexa and Google Assistant Compatible, Home Security by Robert Ryokan

UPDATE: After a few weeks I stopped receiving notifications. When viewing the app, the story was still being sent to the app. After opening the app, I started getting notifications again. This has happened to me twice since I bought it. It's a little annoying because I have to find that it's stopped working to fix the problem. This little guy works really well most of the time. I had 1 day since install when it was patchy but just by opening the app I reconnected and it has been working ever since. I have a mesh WiFi system and many other devices that connect 100% perfectly. I think for the price it's an incredible piece of mind.