A:Answer If self-monitored, it'll sound the siren + send notification on your app + turn on Nest camera (if you have one). If professionally monitored, Professional Monitoring from MONI is now available. $19/m (3-year contract, includes 24x7 monitoring + cellular back) OR $29/m (no contract, 24x7 monitoring + cellular backup). In this case Sensors will trigger the Siren + Let the MONI monitoring center know about the breach + Send notification. And, mostly MONI will call you &/or emergency contact.
I bought the starter pack from MONI for $299 + $19/m professional monitoring. Doesn't beat that IMO :)