Well, I found an old thread of mine where I directly associated an Ecolink contact sensor to a GE/Jasco switch. I have no idea, even if this was possible to the Ecolink siren, what would happen. But it's intriguing idea for a garage solution for me: hook up that contact sensor to one independent AC-powered interconnect-type alarm via a BRK or Zooz relay and have it operate the siren even if the hub was down. Maybe even the Ecolink Firefighter listener device could be associated... In the interest of improved reliability.