The First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup meets new industry standards utilizing First Alert's Precision Detection advance sensing technology. This hardwire smoke alarm is easy to install and replace existing alarms with no need to rewire. Plus interconnect compatible alarms to create a whole home alarm system to help provide an early warning.
The First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup meets new industry standards utilizing First Alert's Precision Detection advance sensing technology. This hardwire smoke alarm is easy to install and replace existing alarms with no need to rewire. Plus interconnect compatible alarms to create a whole home alarm system to help provide an early warning.
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The lowest price for First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup 12 Pack right now is $478.90 at desertcart.com.au.
The all-time low was $478.90 on 6 Nov 2026. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 6 Nov 2026.
First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup 12 Pack
The First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup meets new industry standards utilizing First Alert's Precision Detection advance sensing technology. This hardwire smoke alarm is easy to install and replace existing alarms with no need to rewire. Plus interconnect compatible alarms to create a whole home alarm system to help provide an early warning.
The First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup meets new industry standards utilizing First Alert's Precision Detection advance sensing technology. This hardwire smoke alarm is easy to install and replace existing alarms with no need to rewire. Plus interconnect compatible alarms to create a whole home alarm system to help provide an early warning.
Last updated at 06/11/2026 17:01:48
First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 12-Pack
Delivery between 13–16 Nov $29
| Detected Substances | Smoke |
| Sensor Type | Ionization |
| Detection Method | Ionization |
| Certifications | UL 217 10th Edition Standard, STD UL2034 |
| Standards Compliance | New industry standards |
First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 12-Pack
Delivery between 13–16 Nov $29
| Detected Substances | Smoke |
| Sensor Type | Ionization |
| Detection Method | Ionization |
| Certifications | UL 217 10th Edition Standard, STD UL2034 |
| Standards Compliance | New industry standards |
