The First Alert 3120B is a dual-sensor smoke detector that's effective in sounding a prompt alert regardless of whether you are dealing with a smoldering fire or a flaming blaze. It can be interconnected with other smoke detectors to warn residents throughout the house regardless of where it starts.
- Good at detecting smoldering and blazing fires
- Interconnectible with other First Alert alarms
- Fewer complaints of nuisance alarms
- Hardwired, so installation is more involved