Smart WiFi Light Socket - E26/E27 Smart Bulb Adapter with APP Remote Control & Timer, Wireless Lamp Holder for Smart Home, Compatible with 2.4GHz Network (1PC) - Perfect for Bedroom, Living Room & Home Automation

I was a bit disappointed by the cost. I am getting tired of the way WiFi supporting LED lights seem to just simply die after a few months so decided to go with something a bit more universal that lets me use normal light bulbs of any type I want instead (which makes it a lot easier if you want more neutral ~5000K lights versus so many bulbs targeting the orange-red ~2700K range instead.) These are definitely far more universal in that respect. There are definitely pros and cons on each side.Pros:1. Very universal. You can put any bulb in there provided it doesn't exceed the relay's maximum current (which works out to 40W.) When on it just simply passes the electricity as-is, so it works with any type of bulb.2. The WiFi control support is pretty good and ultimately can link to Google Assistant and I believe both Alexa and Siri as well.3. It has a manual override button to switch on or off even without WiFi. This can be handy especially if your connection is down.Cons:1. The cost is actually rather exorbitant for what it does. It has a much simpler control compared to those LED bulbs and doesn't even have to provide light itself, yet it costs almost as much as those do. All it has to do is switch a relay, not actually control voltage/current to a LED. The four pack is the most cost efficient, but then you're really spending a lot in total instead.2. Upon any kind of power loss -- even a fairly momentary power blink -- they default to off. What this translates to is that if the power blinks, you're now in the dark. It's also inconvenient in that you can't just flip the light switch like you might do with most such things. Most of the wifi bulbs/etc default to on, so if you turn off the switch then turn it back on they'll come back on. These do not. If you flip the switch whether accidentally or otherwise, when you turn it back on you have to either fumble in the dark to turn them back on via the buttons or, once they've reestablished their wifi connection (could take a while if the router went off too) you'll have to issue a command to turn them back on.I get that the relays themselves lose power and thus physically revert to the off position, but once the control circuit is fully "booted up" it could retrieve the last state and reset the relay appropriately. It doesn't. This means you're fumbling around trying to get them back on. Now, I've had WiFi-controlled LED bulbs that defaulted to on and I will admit that it was pretty bad when power blinked at, say, 5am or whatever and suddenly my room is lit up while I'm trying to sleep, but that was very rare indeed. Besides, as I've said, there's no reason it couldn't just save the last state and simply read that upon booting and then default to whatever the last state was. Either way, it's a bit of a big mistake to default to off since it can leave someone standing in the dark potentially with no means of having light just from a simple power blink.3. As with all other such devices they rely entirely on proprietary software to manage them and proprietary services ultimately to control them. Their software seems fairly minimal and clean overall, but the possibility always exists that someday the software may simply stop working or that their services may eventually go down or drop support for what would then be legacy devices. I really want to see more movement towards an open platform and control and I do think people need to bear in mind that these things are possible with all of these sorts of devices. As far as I can tell they do have a writable firmware though, so eventually maybe something will replace all this hopefully.4. Of course this is obvious and you can't really hold it against them, but they do add considerable length to your bulbs. This makes them largely incompatible with a number of fixtures and some lamps. However, I did find that the top of the device is actually roughly the same size as a normal bulb socket and, in fact, my lamp shade would fit over that. It makes it a bit uglier since the bottom of the socket sticks out below the shade visibly, but it puts the actual bulb fully within the lampshade as it should be so the light coming out is more controlled, which is more important. This is likely less of an issue with big lamps than with small ones and may not matter either way with them.5. Kind of a minor nitpick, but the relays are quite loud. This is mostly harmless and I wouldn't dock a single star from the rating for that, but it bears mentioning at least. Perhaps some might potentially even consider this a pro.