Opening a FireX FXW-R 1987 vintage?

[Mhgk]

@TheAlmightyZach

Despite our previous conversation about Kidde, I won’t discredit the fact that their alarms are UL 217 compliant and go through proper testing just the same as First Alert. They DO have a 10 year battery with hard wire model that isn’t a smart device: Smoke Alarm, Hardwired with 10-Year Backup Battery 20SA10 | Kidde

First Alert also has these (but only ionization to my knowledge). The new SM6 and SM6W will be photoelectric, hardwired, and have 10-year batteries.