WiFi range limited for sprinkler controller?

While the phone gets maximum WIFI bars, the sprinker controller doesn’t connect. Is there a fix to increase the reception of the WIFI signal to the controller? Otherwise it looks like i’ll have to move the controller next to the modem!

If you are running dual band wifi, 2.4/5ghz (new normal), the wyze only work on the 2.4ghz signal.
Make sure your unit is connected to the 2.4ghz.

Running 2.4ghz.