SONOFFDW2 WiFi Wireless Door Window Alarm Sensor with Phone Alerts, No Hub Required, Works with Alexa & Google Home, Low-battery Reminder, 2.4GHz WiFi Connectivity

The media could not be loaded. If, like me, you have kids that leave the freezer open, and you go to it the next day and find all your expensive meats thawed out, it drives me crazy I have to throw all that meat in the bin. Well no more wasted meat!!!I like this because.....- Easy to install- Notifies me via notification- Simple and effective- Low cost- Two AAA batteries and install within seconds. I use amazon basics researchable batteries, these are great too.Hope you like it like me :) Well done sonoff, big fan!

I was impressed how easily these were to set up electronically. Although I did have a little difficulty in siting the one on a door that did not close flush with the frame as both the items need to be lined up flush. Initially I was quite happy with the setup. So much so that I nearly ordered more. However, 24 hrs later and I was being advised to change the batteries. after a further 12 hrs they stopped working. Maybe I had a bad batch of batteries. Bought new batteries and fitted them. Hey presto everything working fine again. That was short lived. 12 hrs later I'm being advised to change the batteries. So unless you intend to change the batteries every day then they probably aren't what you want. Easy to set up but a nightmare to maintain! I would have expected the batteries to last at least a month!Steer Clear!

Unless the unit I got is somehow defective (but I'm not going to buy another one to try it), this product is a joke. Battery life is terrible, the first set of batteries (2xAAA) I used lasted for about 7 days. The second set only lasted less than 3 days!Look at the graph taken from Home Assistant, the one named as "Fridge Door Battery" is this Sonoff sensor. Battery went down to 70% after just a few hours, and then became erratic until was completely drained a few hours later. Compare to the other graph (Contact Sensor Batter), this is from another similar sensor (different brand), but the battery has been solidly constant at 100% during the last 3 days.Battery is supposed to last for about a year in these kind of sensors. I already spent more in batteries than the sensor itself, and now I'm with a useless piece of plastic.The sensor itself works well when is poweredUpdate 03/10: Sonoff after-sales contacted me and after a few tests, they recognised the product was defective. They offered sending me a new sensor, but since I've already got another one, I opted for a refund, which they promptly did.

So, functionality wise these sensors are spot on. Pared to the ewelink app no problem, then to Alexa, Goole Hone and Home Assistant. However, these are battery powered devices and as such the have a VERY limited WiFi range.I have one device with a 2.5m direct line if sight to the WiFi AP and the RSSI is -89db, my second device is 5m from the same AP and is reporting -101db (my phone reports -56db at the same position). These figures are appallingly bad, but just enough to be functional. In summary, your going need excellent WiFi coverage for these sensors to work. Look at the RSSI figure on your phone at the position you want to place the sensor. If this is -60db and up, then forget it.

I bought this product with a attempt of simply trying to expand the functionality of my current sonoff light switch. However after reading some negative comments about it, I have to say it did almost put me off from buying this great productI have been using this for almost 2 weeks and I have never come across with any issues what so ever. Setup is piece of cake, no wires just battery powered and simply stick on to the door with the supplied 3m sticky pad. What amaze me the most is the responsiveness, as you can see from my video, it turn on/off almost instantly.For those who used the ewelink app, this is not going to any issues, you just simply setup the the device to trigger an action on your WiFi switch using 'scene'.Please don't let the negative comments put you off buying this great product and try it out yourself. I will give me more stars if I could simply because the functionality/cost.

I bought these as a cheaper alternative to my smart things switches, they're a little ugly but for the price I can't complain, I wanted these installed on my loft hatch (to automatically switch my loft lights on/off) & one on the shower door (So it could automatically switch the bathroom fan on/off using a sonoff switch) Alexa seen these no problem but the routines refused to work, for anyone facing the same issue, I disabled the eWelink skill then re-enabled it and all my Sonoff DW2 routines seem to be working now.

Not good with battery consumption, this is one of the few Sonoff products that disappointed me. SONOFF should release a newer version that is not battery hungry.

Very simple to install and operate / set up. Need to make sure 2.4ghz wifi but after initial set up, I can return to mixed 2.4/5.Very happy - used with Amazon alexa rules to announce when the door is opened between midnight and 5am, turn on nearby lights and announce entry-recognised to anyone in there.Very happy