Wyze Hub stays on after power off?

Testing the Wyze home monitoring. When I unplug the power, the 3 blue lights remain on. Does the hub have a rechargeable battery inside?

The sensor hub has a battery that is charged when the hub is plugged in. I believe that the system can operate locally (physical siren only) when the power goes out.
I haven’t been able to test how long the battery lasts yet, but I would not think it’s longer then a few hours.