{"product_id":"first-alert-hardwired-smoke-and-carbon-monoxide-alarm-2-pack-sc-9120b-with-battery-backup-ionization-electrochemical-sensors","title":"First Alert hardwired smoke and carbon monoxide alarm 2-Pack — SC-9120B with battery backup, ionization + electrochemical sensors","description":"\u003cp\u003e\u003cstrong\u003eThe First Alert SC-9120B is a hardwired combination smoke and carbon monoxide alarm with battery backup, sold as a convenient 2-pack for whole-home protection.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis dual-sensor unit pairs an ionization smoke detector with an electrochemical carbon monoxide sensor to monitor both threats from a single device. Designed to be hardwired into a home’s electrical system and linked to other compatible First Alert or BRK detectors, the SC-9120B provides continuous monitoring even if the AC power fails thanks to its side-load battery backup. Visible indicator lights and a single test\/silence button simplify operation and maintenance.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this alarm detect both smoke and carbon monoxide?\u003c\/h3\u003e\n\u003cp\u003eThe SC-9120B combines two proven sensing technologies in one housing: an ionization chamber for fast detection of flaming fires and an electrochemical cell for steady CO monitoring. Each sensor communicates with the unit’s circuitry to trigger the alarm when levels exceed safety thresholds. Indicator lights help you quickly identify whether the alert is smoke or carbon monoxide so you can respond appropriately.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIonization sensor for quick response to small-particle smoke from flames\u003c\/li\u003e\n  \u003cli\u003eElectrochemical CO sensor for accurate carbon monoxide detection\u003c\/li\u003e\n  \u003cli\u003eSeparate lights show smoke or CO activation for clearer alerts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I interconnect multiple alarms throughout my home?\u003c\/h3\u003e\n\u003cp\u003eYes — the SC-9120B is designed for interconnection with other compatible First Alert or BRK hardwired detectors. When wired together, an alarm triggered in one location will sound all connected units, improving the chance occupants hear warnings no matter where they are in the house. Interconnect wiring is a common feature for whole-home safety plans but should be installed according to local electrical codes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWorks with compatible First Alert and BRK hardwired alarms\u003c\/li\u003e\n  \u003cli\u003eAll interconnected units sound when one detector trips\u003c\/li\u003e\n  \u003cli\u003eInstallation requires proper wiring and adherence to code\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat happens if the power goes out — will the alarm still work?\u003c\/h3\u003e\n\u003cp\u003eThe unit includes a side-load battery compartment for backup power, ensuring continued operation during AC outages. This battery keeps both the smoke and CO sensors active and allows the alarm to sound if hazardous conditions develop while the main power is interrupted. Regular battery checks and replacement are still recommended for reliable backup performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSide-load battery compartment for simple access and replacement\u003c\/li\u003e\n  \u003cli\u003eBattery backup maintains protection during power failures\u003c\/li\u003e\n  \u003cli\u003eTest\/silence button verifies function without removing the unit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is this alarm to operate and maintain?\u003c\/h3\u003e\n\u003cp\u003eOperation centers on a single test\/silence button that checks sensor function and temporarily silences nuisance alerts. The side-load battery design makes swaps quick, and visible lights indicate whether an alarm is for smoke or carbon monoxide, reducing confusion in an emergency. Periodic testing and following the manufacturer’s replacement timeline will keep the unit performing as intended.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOne-button test and silence for straightforward control\u003c\/li\u003e\n  \u003cli\u003eVisible status lights differentiate smoke versus CO events\u003c\/li\u003e\n  \u003cli\u003eAccessible battery compartment simplifies maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The First Alert SC-9120B 2-pack is suitable for homeowners and landlords who want a compact, hardwired solution that combines smoke and carbon monoxide detection in a single device. It’s a practical choice for new installations or upgrades where interconnectivity and battery backup are priorities, and for anyone seeking clearer event indication with separate smoke\/CO lights.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can the SC-9120B be interconnected with other alarms?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It connects to compatible First Alert or BRK hardwired detectors so all linked units sound together.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the alarm work during a power outage?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The side-load battery backup keeps the smoke and CO sensors active when AC power is lost.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"First Alert","offers":[{"title":"Default Title","offer_id":52898614444344,"sku":"B078HW9GY4","price":257.29,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/6799\/6984\/files\/first-alert-sc-9120b-front-view.jpg?v=1788368046","url":"https:\/\/kelorix.ca\/products\/first-alert-hardwired-smoke-and-carbon-monoxide-alarm-2-pack-sc-9120b-with-battery-backup-ionization-electrochemical-sensors","provider":"Kelorix Canada | Shop Home, Electronics, Beauty, Toys \u0026 More","version":"1.0","type":"link"}