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The lowest price for First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup right now is $35.53 at Raptor AU, compared across 3 retailers.
The all-time low was $32.52 on 9 June 2026 — today's price is 9% above the lowest ever. That's a little above the best price we've seen.
Prices last updated 6 Oct 2026.
First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup
Last updated at 06/10/2026 10:33:20
Brk Smi100ac Smoke Alarm, Smoke, Hardwired, Battery Backup, Smoke Detector, Ionization, Hardwired
Delivery $83.79
Hardwire Smoke Alarm
Delivery between 12–15 Oct $29
First Alert Hardwire Smoke Alarm with Voice Alerts
Delivery $39.36
| Detected Substances | Smoke |
| Sensor Type | Ionization |
| Detection Method | Ionization |
| Certifications | UL 217 10th Edition Standard, STD UL2034 |
| Standards Compliance | New industry standards |
Brk Smi100ac Smoke Alarm, Smoke, Hardwired, Battery Backup, Smoke Detector, Ionization, Hardwired
Delivery $83.79
Hardwire Smoke Alarm
Delivery between 12–15 Oct $29
First Alert Hardwire Smoke Alarm with Voice Alerts
Delivery $39.36
| Detected Substances | Smoke |
| Sensor Type | Ionization |
| Detection Method | Ionization |
| Certifications | UL 217 10th Edition Standard, STD UL2034 |
| Standards Compliance | New industry standards |
