HMS sensors connect to Sense hub via wifi or other frequency?

If sensors communicate to the sense hub via Wifi, the system could be sabotaged with a wifi jammer. However if they use a different frequency, then as long as the hub is hard-wired to the router, then the system cannot be brought down with wifi jammers.

My thinking is, hardwire the hub to the router and hide the hub in an inaccesible place, so that an intruder cannot easily reach to it and disconnect from router before sending the help signal to the central station.

Sensors communicate directly to the hub via radio and not WiFi.