EDIT: It's been a month or so since I wrote my review, and tonight, I had my first experience with the smoke detector going off. First, at some point since I set up my second smoke detector, the one that was giving my my issues, Onelink updated their app to have iOS 14 support. I can't speak to whether or not that fixed the issue I was having, but I hope so. Second, tonight while cooking dinner, we created a large amount of smoke fast. WIthin a minute, our kitchen was filled with smoke. Before then, the smoke detector went off, so we know it works, and it causes our basement smoke detector to also go off. Great, the system works. I hit the button to silence it. The siren keeps going. I hit it again and again, and nothing. I look at my phone, and I don't have a notification. I open up HomeKit to see if I can turn it off, and nothing really has registered there. I track down the app and open it. It gives me a pop-up notifying me that my smoke detector is going off and an option to call 911 or to silence it. I hit silence, and nothing. Turns out, I have to hold down silence. We eventually get it to quiet down and continue our dinner preparation. Ten minutes later, we set it off again. I try holding down the button on the smoke detector. Nothing. So, I open up the app again to stop it. I eventually do stop it, but seconds later, it starts going again. I silence it again. Still goes off. It keeps doing this. A message on the screen says its because there is too much smoke. I can't get it to shut up, even though our windows are all open, our microwave vent is going and I'm trying to fan the smoke out. Eventually, after trying to silence it more than five or six times only to have it go off again, I take it off the wall, put it in the bathroom, turn on in the fan in there and close the door, leaving it there until we've finished making dinner. I understand the need for going off even if it continues to detect smoke. However, it would be nice if there was a 30 second delay after silencing it before it goes off again. It would be even nicer if we could just set it to ignore smoke for 10 minutes. I don't know if these options are possible due to various fire codes and regulations, but having it screech constantly is not helpful. Furthermore, we could only handle this situation because there were two of us cooking. Had it been only me, I surely would have burnt the food (the smoke was the result of oil being too hot). Had it been my girlfriend, she would have had to step away from the kitchen to get a stepladder to hit the button or to take the dumb thing down. And being forced to put it in another room just to be able to finish cooking is extremely unsafe. If we had forgotten it there, we could have risked burning our house down. So, I'm removing another star from my review. It's a neat device, but set up is/was an absolute pain and it works too well. I don't recommend buying or using this smoke detector, and I regret buying the wired version for my family as a Christmas present now. ~~~~~~~~ I've purchased two of these smoke detectors. The first I set up in my basement. Installation was a breeze. Mark out and drill a couple of holes for the mounting bracket. The bracket is engineered so that the installer can adjust the bracket to make sure the mount is straight/level, although it doesn't make this clear. Set-up for the first detector I purchased was fairly easy. I downloaded the Onelink app and had to set up a Onelink account. Unfortunately, it seems that this can only be done using the app. This was slightly frustrating because I use 1Password as a password manager, and it is difficult to have 1Password generate a password in an app (especially since the app seemed reluctant to let 1Password fill in any information). Barring that, set up was surprisingly smooth for a HomeKit device. Using the Onelink app, I added it to my Home app and then connected it to my Wi-Fi. After using the test function to make sure it worked ok, I set up an Automation in my Home app so that if it detected carbon monoxide in my basement, it would shut off my thermostat (assuming that my furnace would be the cause of the CO). A month later I purchased a second for my kitchen. Installation was much the same, but set-up was a much bigger hassle. Using my iPhone 11 Pro on iOS 14.2, I could add the smoke detector to my Home app, but I could not get it to connect to my Wi-Fi (A dual-band Wi-Fi 5 Eero set up as a HomeKit router). No matter what I did, I could not get this device to work. I tried to connect to it using the app multiple times, restarting my phone, restarting my Eero, logging in and out of my Onelink account, disabling 5 GHz, setting it up through the Home app, setting it up through the Eero app, and trying to connect it to my Wi-Fi through my Settings app to no luck. Each time, I would get an error saying that it couldn't set up the smoke detector. Searching for this error online provided no results. At times I could get the smoke detector in my Home app, but couldn't do anything with it because it wasn't connected to my network. What did finally work was using my iPhone 7 with iOS 13.3 on it. I downloaded the Onelink app to it and logged in. My Home app information synced to my iPhone 7 through iCloud. I connected it to my Home app and then was able to connect it to my Wi-Fi, completing the set-up. Then, the data on my iPhone 7 synced with my iPhone 11 Pro via iCloud and the other home's residents via HomeKit. When trying to set up the device on my iPhone 11 Pro, the app said that a Wi-Fi connect dialog would appear, but it never did. It did on my iPhone 7. I assume that was the issue. Onelink should work with Apple to make sure this dialog appears during the set-up process or permit users to set-up this smoke detector entirely through the Home app. Right now, I'm largely pleased with the two that I have, but requiring me to dig out an old iPhone with an older version of the system software is unacceptable. Not everyone will have an older device lying around that they can use, and fewer will think to do so. However, should this device fail to detect smoke in my kitchen (which, for better or for worse, does happen on occasion), I will revise this review accordingly.
