Is the SSA3 outdoor siren Compatible with 2GIGv1.17?
What is the best Zwave siren for outdoor use?
There is no official compatibility stated, but other Fortrezz models are compatible so I would imagine so.
The only other one I am aware of is this, and I could not say whether or not it would work with the 2GIG Panel. I would try the Fortrezz first. Keep in mind that neither should be placed in direct exposure to elements.