Improve your home safety with BRK's hardwired smoke alarm, featuring an ionization sensing chamber to detect fast-flaming fires while minimizing false alarms. This direct wire fire detector is interconnectable with up to 18 other alarms, 12 of which can be other BRK or First Alert smoke alarms, for added security throughout your home. With its 120 Volt AC power supply and a reliable 9 Volt battery backup (included), your protection remains in tact even in power outages. Test that all alarm features are working properly using the full-function test button to simulate smoke conditions. Identify and manage alarm conditions with ease using the latching alarm indicator, and rely on the audible end-of-life signal to notify you when it's time to replace the unit. This ionization sensor smoke detector features tamper-resistant locking pins that prevent the battery drawer from being opened as well as keeping the alarm secured to the mounting bracket when in use. Purchase your BRK hardwired smoke alarm (1046836) today to help keep your home secure.
Improve your home safety with BRK's hardwired smoke alarm, featuring an ionization sensing chamber to detect fast-flaming fires while minimizing false alarms. This direct wire fire detector is interconnectable with up to 18 other alarms, 12 of which can be other BRK or First Alert smoke alarms, for added security throughout your home. With its 120 Volt AC power supply and a reliable 9 Volt battery backup (included), your protection remains in tact even in power outages. Test that all alarm features are working properly using the full-function test button to simulate smoke conditions. Identify and manage alarm conditions with ease using the latching alarm indicator, and rely on the audible end-of-life signal to notify you when it's time to replace the unit. This ionization sensor smoke detector features tamper-resistant locking pins that prevent the battery drawer from being opened as well as keeping the alarm secured to the mounting bracket when in use. Purchase your BRK hardwired smoke alarm (1046836) today to help keep your home secure.
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The lowest price for SMI100-AC BRK 9120B-6 Hardwired Smoke Detector with Battery Backup right now is $207.00 at Ubuy Australia.
The all-time low was $207.00 on 4 Nov 2026. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 4 Nov 2026.
SMI100-AC BRK 9120B-6 Hardwired Smoke Detector with Battery Backup
Improve your home safety with BRK's hardwired smoke alarm, featuring an ionization sensing chamber to detect fast-flaming fires while minimizing false alarms. This direct wire fire detector is interconnectable with up to 18 other alarms, 12 of which can be other BRK or First Alert smoke alarms, for added security throughout your home. With its 120 Volt AC power supply and a reliable 9 Volt battery backup (included), your protection remains in tact even in power outages. Test that all alarm features are working properly using the full-function test button to simulate smoke conditions. Identify and manage alarm conditions with ease using the latching alarm indicator, and rely on the audible end-of-life signal to notify you when it's time to replace the unit. This ionization sensor smoke detector features tamper-resistant locking pins that prevent the battery drawer from being opened as well as keeping the alarm secured to the mounting bracket when in use. Purchase your BRK hardwired smoke alarm (1046836) today to help keep your home secure.
Improve your home safety with BRK's hardwired smoke alarm, featuring an ionization sensing chamber to detect fast-flaming fires while minimizing false alarms. This direct wire fire detector is interconnectable with up to 18 other alarms, 12 of which can be other BRK or First Alert smoke alarms, for added security throughout your home. With its 120 Volt AC power supply and a reliable 9 Volt battery backup (included), your protection remains in tact even in power outages. Test that all alarm features are working properly using the full-function test button to simulate smoke conditions. Identify and manage alarm conditions with ease using the latching alarm indicator, and rely on the audible end-of-life signal to notify you when it's time to replace the unit. This ionization sensor smoke detector features tamper-resistant locking pins that prevent the battery drawer from being opened as well as keeping the alarm secured to the mounting bracket when in use. Purchase your BRK hardwired smoke alarm (1046836) today to help keep your home secure.
Last updated at 04/11/2026 11:17:58
SMI100-AC BRK 9120B-6 Hardwired Smoke Detector with Battery Backup, 6-Pack (6)
Delivery between 8–12 Nov $41
| Brand | First Alert |
SMI100-AC BRK 9120B-6 Hardwired Smoke Detector with Battery Backup, 6-Pack (6)
Delivery between 8–12 Nov $41
| Brand | First Alert |
