I've been searching around. I see there's a First Alert that would work, except it's battery operated.
Halo has one that would fit. Has anyone tested it? Any other make models that anyone has tested?
Hi Dan. Thank you for this information. I considered that as well. Just seeing if there are options\products I didn't consider. Please keep any ideas coming. Thank you again for your input. Cruzen2011
Currently there are no other options that work within the ring ecosystem itself that are wired. The wireless combo detectors are reasonably priced and work great. I've had mine installed for almost five years (most with a previous alarm system.)
If you have a wired or wirless system that are interconnected (when one goes off they all do) you would just need one listner.