Networked isn't really the right term. Hardwired fire alarms are the new requirement. They just have AC power with battery backup and an additional wire that triggers all the wired alarms to go off when one goes off.
In Maryland at least, there are non-hard-wired alternatives in some cases that aren't new construction but still trigger an upgrade required.
I have some that have "long-term tamper-proof batteries" (I think they last 5 years or something)... and _somehow_ are "interconnected" (so they can all trigger each other) which was a requirement. They don't use _my_ wifi, I don't know how they are interconnected without wires exactly (or if it even really works). I'm not worried about it, but it passed inspection.
I have some that have "long-term tamper-proof batteries" (I think they last 5 years or something)... and _somehow_ are "interconnected" (so they can all trigger each other) which was a requirement. They don't use _my_ wifi, I don't know how they are interconnected without wires exactly (or if it even really works). I'm not worried about it, but it passed inspection.