Beautyrest Black 4+

First, the instructions in the manual are poor. If you bought a B-rest Black adjustable base, you have the WiFi module. This device only works at 2.4ghz, so your router needs to support 2.4 and the device you are pairing needs to be on 2.4 as well. If you are using AT&T with their AirTies based router, this will work if both networks are given the same name and password. Download the app and register, then EXIT the app. Hold your foot up & foot down buttons on the remote while near the bed (which has to be powered) and you will hear a faint beeping. Once you hear the beeps, release the buttons and go to your WiFi settings. Look for KS.... that’s the bed and connect. Now go back into the app and finish.

That isn’t clear in the manual because they insert all of the Alexa and google assistant stuff.

It works, but the Alexa and google voice commands are limited, or not detailed enough.

The app does work once you get the base connected. The problem is getting the base connected and that will take a few tries. That is is the reason for 4 stars. I also enabled the skill for Alexa and that actually worked from the first try.
This will only work on the 2.4G wifi and your smart device and base will have to be on the same network. I noticed that after pressing the two buttons at the same time, that mode does not last long and I had to move fast to get it to work. That mode should last long enough to be able to finish the setup... Mine did not and that is why I had to start over a few times until I was able to finish the setup before the mode ended.
But in the end everything works as described in the manual.

Find the user manual for how to pair the app to your base. If you rely on the app you will literally never get it connected. You need the user manual because it’s NOT intuitive and it’s NOT explained in the app. Another reviewer here explained the process to give you an idea. Once it’s paired it works well but EESH. That was rough.