{"product_id":"first-alert-brk-9120b-hardwired-smoke-alarm-with-battery-backup","title":"First Alert BRK 9120B Hardwired Smoke Alarm with Battery Backup","description":"\u003cp\u003eOur review of the First Alert BRK 9120B finds it best suited for homeowners replacing older hardwired detectors who want straightforward installation and dependable smoke sensing. The bottom line: this unit pairs a 120-volt AC connection with a 9-volt battery backup and an ionization sensor to detect fast-flaming fires quickly, and its single-button silence\/test control and loud 85dB alarm make everyday use easy. Installers should confirm wiring polarity and tight wire nut connections, since a loose neutral (white wire) in the junction box can cause malfunctions.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardwired with battery backup:\u003c\/strong\u003e The 120-volt AC power keeps the detector continuously powered while the included 9-volt battery provides protection during outages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIonization smoke sensor:\u003c\/strong\u003e Detects hot, fast-flaming fires reliably, making it a good choice for living areas and kitchens where flame-driven fires are a concern.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e85dB alarm:\u003c\/strong\u003e The loud audible alert helps ensure household occupants will hear the alarm from other rooms or while asleep.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-button silence and test:\u003c\/strong\u003e Simplifies routine testing and allows temporary silencing of nuisance alarms without removing the unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTamper resistant locking pins:\u003c\/strong\u003e Provide additional security against accidental removal or tampering in family homes or common areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImported design:\u003c\/strong\u003e A tried-and-true form factor that fits standard ceiling and wall mounting locations and replaces many older units.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe 9120B is ideal for homeowners, landlords, and renovators replacing older hardwired smoke alarms who want a reliable, no-frills detector with battery backup and an ionization sensor. It is also suited to anyone who prefers a simple one-button operation and a loud 85dB alert for improved household safety.\u003c\/p\u003e\n\u003cp\u003eThose who want photoelectric sensing for smoldering fires or an interconnected smart alarm system with wireless app features should look elsewhere; this model focuses on dependable ionization detection, hardwired installation, and basic backup power rather than networked or dual-sensor capabilities.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDependable hardwired power with included 9-volt battery backup for outages.\u003c\/li\u003e\n\u003cli\u003eEasy to install for experienced DIYers and pros, with customers reporting fast replacement in under 15 minutes.\u003c\/li\u003e\n\u003cli\u003eClear single-button test and silence control makes routine maintenance simple.\u003c\/li\u003e\n\u003cli\u003eTamper resistant design increases security in shared or multi-occupant settings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUses an ionization sensor only, so it is less focused on smoldering, slow-burning scenarios compared with photoelectric models.\u003c\/li\u003e\n\u003cli\u003eRequires careful wiring checks; a loose neutral (white wire) in the junction box can cause device malfunction if not secured.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003e120-Volt AC with 9-Volt battery backup (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Type\u003c\/td\u003e\n\u003ctd\u003eIonization smoke sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlarm Volume\u003c\/td\u003e\n\u003ctd\u003e85 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTamper Protection\u003c\/td\u003e\n\u003ctd\u003eTamper resistant locking pins\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControls\u003c\/td\u003e\n\u003ctd\u003eSingle button silence and test\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eHardwired ceiling or wall mount; verify wiring polarity and secure wire nut connections\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe First Alert BRK 9120B is a practical, no-frills hardwired smoke alarm that will satisfy most homeowners replacing older units. It offers reliable ionization detection, an audible 85dB alarm, and a 9-volt battery backup, making it good value for those who need a straightforward replacement that fits standard fixtures and is simple to install.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this alarm work during a power outage?\u003c\/strong\u003e\u003cbr\u003eYes, it uses a 9-volt battery backup (included) to keep the alarm functioning when AC power is lost.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should I check during installation?\u003c\/strong\u003e\u003cbr\u003eConfirm wiring polarity and that all wire nut connections are secure, especially the neutral (white) connection in the junction box, to avoid malfunctions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat kind of fires does the sensor detect best?\u003c\/strong\u003e\u003cbr\u003eThe built-in ionization sensor is designed to detect hot, fast-flaming fires quickly and reliably.\u003c\/p\u003e","brand":"First Alert","offers":[{"title":"Default Title","offer_id":48187434238171,"sku":"B078HGZ54S","price":55.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61-ZPOpdqTL._AC_SL1000.jpg?v=1769651333","url":"https:\/\/gearmusthave.com\/products\/first-alert-brk-9120b-hardwired-smoke-alarm-with-battery-backup","provider":"GearMustHave","version":"1.0","type":"link"}