Let me start by saying this little gadget has been a game-changer for my home security. The TREATLIFE WiFi Smart Door Sensor is one of those devices that just works without any fuss.

The setup was ridiculously easy – no hubs, no wiring, just peel and stick with the included adhesive. I slapped mine on my front door in under 5 minutes. The 2.4GHz WiFi connection was simple to establish through the Treatlife app (though fair warning – it doesn't work with 5G networks).

What I love most are the instant alerts. Whether I'm at work or just in another room, my phone buzzes immediately when someone opens the door. The app lets me check door status anytime, and I've even set up Alexa routines to announce "Welcome home" when I arrive – such a nice touch!

The battery life has been impressive – going strong after 4 months on the included AAA batteries. The low battery warning through the app is super handy too.

Now for some real talk: The included adhesive could be better (I ended up using my own double-sided tape after a week). And while it works great with Alexa and Google Assistant, Home Assistant users might be disappointed as it's not natively compatible.

For under $20 though? This sensor delivers serious value. It's reliable, responsive, and gives me peace of mind knowing I'll always be alerted if someone enters my home. If you're looking for an affordable way to smarten up your doors and windows, this is definitely worth considering.