| Ionization Sensor – may detect invisible fire particles (associated with flaming fires) sooner than photoelectric alarms. |
| Photoelectric Sensor – may detect visible particles (associated with smoldering fires) sooner than ionization alarms. |
| Interconnect – Interconnects with up to 24 Kidde devices on one wiring network of which 18 can be initiating. |
| Battery Backup (9V battery included) – Provides continuous protection even during power outages. |
| Tamper Resistant – Deters from tampering or theft. |
| Hush® Feature – Temporarily silences nuisance alarms. |
| Red LED – Flashes every 30-40 seconds to indicate that the smoke alarm is operating properly. |
| Test/Reset Button – Tests smoke alarm circuitry and horn.
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