SONOFF SNZB-04P Zigbee Door Window Sensor, Send Alert to Your Smartphone for Home Security, Compatible with Alexa/Google Home, SONOFF Zigbee Bridge Required, Batteries Included

For a while now, I've been using door and window sensors built on ESPHome, using regular hall sensors, hooked up to Home Assistant.It was initially an experiment to see whether I'd actually find a use for them (I did). They worked fine, but running cables for 4 of them looked messy.I decided to buy a Zigbee USB gateway recently, intending to try some 'kinetic wireless switches' (which didn't work) in order to control lights and provide some other automations. Since my original plan didn't work out, I figured it was time to see whether Zigbee was worth it.It is. It really is. It took me all of ~10 minutes to pair 4 of these sensors into HA (using the built-in zigbee integration) with no significant trouble discovering them. The response time of them is really good, and connectivity is decent.The installation is very simple, requiring only the removal of the adhesive tape cover and then pressing into place for both pieces. The detection range/sensitivity between both pieces is decent too. Evidently, the magnet used in the smaller piece is decently powerful.I don't yet had any insights to share on battery life. I'm hopeful that the 5-year estimate is somewhat accurate, but even if it only gets half the time, that still represents an extremely good value proposition.

I'm using these on a couple of bathroom doors to tie in to Home Assistant and automate the lights.A couple of months in I can confidently say they're working very well, no connection drop outs and very reliable detection of opening/closing.Bit early to comment on battery life but looking at the reported numbers they seem like they're going to live up to the promise.For the price I'm comfortable recommending these.

Works well with Home Assistant. Strange battery; hopefully, it works for a good while.

Work perfectly in zigbee2mqtt, report accurately, and no losses/disconnects

bought first one to try see if batteries last longer than my Samsung Smartthings contacts . . YES they do delighted with the zigbee range and easy to set up in my Smartthings app . . so stop wasting money every month on batteries for samsung contacts and buy these.

Excellent door contact sensor.Battery life is to be determined so will update this review if it fails early. Connects to homeassitant without issue and so far hasn't lost contact since installation weeks ago. Far better than the Ikea Parasoll which was very hit and miss and at the time of writing this, has a warning on the Zigbee2MQTT database. This has no such issue.

Great equipment works a dream. Easy to set up.

Only got one and lasted 4 months terrible purchase