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Item #:
163233
BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack
89% of respondents would recommend this to a friend
Item #:
163233
MWK 91366
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Promote greater household safety with the First Alert 9120B Hardwired Smoke Alarm with Battery Backup. This 120 volt AC smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, fast flaming fires and alerts you with a loud 85 decibel alarm.
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Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.
What Stands Out
Reliable Hardwired
The hardwired connection ensures continuous power supply, minimizing the risk of failure while providing dependable smoke detection at all times.
Battery Backup
Equipped with a battery backup, this smoke detector maintains functionality during power outages, ensuring peace of mind and safety for households.
User-Friendly Design
The sleek, white design blends seamlessly into any home decor while offering easy installation and maintenance, making it accessible for all users.
Product Details
- Hardwired smoke alarm with battery backup for constant monitoring, even during power outages
- Ionization sensor detects smoke from fast flaming fires and triggers an 85-decibel alarm
- Installs easily and can connect with other compatible BRK or First Alert smoke detectors
- Features a single test/silence button, tamper-resistant locking brackets, and universal mounting brackets
- UL tested and meets standards, with 120-volt AC power and a 9V battery backup
- Comes with 9-volt battery and user's manual, and is approved for sale in Oregon after new revisions on law HB2586
| Brand | BRK |
| Model Number | 9120B |
| Global Trade Identification Number | 00029054015327 |
| Unit Count | 1 Count |
| Number of Items | 1 |
| Manufacturer | First Alert |
| UPC | 029054015327 |
| Built-In Media | smoke detector, batteries, mount |
| Item Type Name | Smoke Detector Alarm |
| Mfr Part Number | 9120BFF |
| Power Source | Battery Powered |
| Alarm | Audible |
| Sensor Type | Ionization |
| Operating Humidity | 10-95% RH |
| Product Style | 9120BFF |
| Color | White |
| Item Dimensions D x W x H | 5.6"D x 5.6"W x 2.2"H (14.2 x 14.2 x 5.6 cm) |
| Item Weight | 22.68 g |
| Style | 9120BFF |
| Product Dimensions (L x W x H) | 5.6"D x 5.6"W x 2.2"H (14.2 x 14.2 x 5.6 cm) |
Dangerous Goods
To avoid the delay in customs clearance process for Dangerous Goods, the shipment shall be opened at our warehouse facility to check the severity of hazardous components. Please see the list of Dangerous goods here.
Who Should Buy?
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Homeowners
Ideal for homeowners needing reliable smoke detection with battery backup during power outages.
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Renters
Great for renters looking for an inexpensive, easy-to-install smoke alarm with essential safety features.
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Families
Perfect for families who prioritize safety and require a dependable alarm system for peace of mind.
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Frequent Movers
Not suitable for those who frequently move, as hardwired alarms require professional installation.
Product Description
BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack
About This Item
Introducing the First Alert BRK 9120B Hardwired Smoke Alarm with Battery Backup. This reliable smoke alarm ensures constant monitoring for the life of the alarm, even during power outages, thanks to its 10 year battery backup. Your safety is our top priority, which is why this smoke alarm features an ionization sensor that detects smoke and fast-flaming fires.
With its loud 85-decibel alarm, you'll be alerted immediately in case of an emergency. We understand that nuisance alarms can be frustrating, so we've included a convenient one-button silencing feature to easily silence any false alarms. You can also test the detector functions with a simple press of a button.
To provide you with peace of mind, this smoke alarm is equipped with lights that indicate if smoke is detected. This feature helps you quickly identify potential dangers. Additionally, the latching alarm indicator automatically identifies which unit initiated the alarm, even after the conditions that triggered the alarm have subsided.
We also care about the longevity of our products, which is why this smoke alarm includes an end-of-life signal that alerts you when it's time to replace the unit. This ensures that you and your loved ones are always protected. Connect this smoke alarm to compatible BRK or First Alert alarms within your single-family residence for enhanced safety.
When one alarm is triggered, all connected alarms will sound, providing you with maximum protection. Invest in the peace of mind that comes with the First Alert BRK 9120B Hardwired Smoke Alarm with Battery Backup. Don't leave your safety to chance, choose a reliable and trusted brand like First Alert.
Order yours today and experience the difference for yourself.
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Customer Questions & Answers
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Question:
What features does the BRK First Alert 9120BFF SMI100-AC Smoke Detector offer?
Answer: The BRK First Alert 9120BFF SMI100-AC Smoke Detector includes hardwired connections for reliable power and a battery backup to ensure functionality during power outages. It features an electrochemical sensor for precise detection of smoke, minimizing false alarms. This smoke detector also comes equipped with an easy-to-read indicator and a test/silence button for user convenience, making it ideal for residential and commercial settings where safety is paramount. -
Question:
How does the battery backup work in the BRK First Alert 9120BFF?
Answer: The battery backup in the BRK First Alert 9120BFF ensures that even during a power outage, the smoke detector continues to operate. This feature is particularly crucial for maintaining safety during emergencies when power may be lost. It typically uses a 9V battery that works in conjunction with the hardwired system, giving you peace of mind while ensuring continuous protection in various scenarios. -
Question:
Can I connect the BRK First Alert 9120BFF to other smoke detectors?
Answer: Yes, the BRK First Alert 9120BFF is designed to interconnect with other compatible smoke alarms, enhancing overall safety in larger spaces. When one alarm is triggered, the interconnected system alerts all units, making it an excellent choice for multi-level homes or commercial properties. This interconnected system ensures that every area is covered efficiently. -
Question:
How often should I test the BRK First Alert 9120BFF smoke detector?
Answer: It is advisable to test the BRK First Alert 9120BFF smoke detector monthly to ensure that it’s functioning properly. Simply press the test/silence button to check the unit. Regular testing promotes a proactive approach to safety, helping to ensure that you’re prepared in the event of an emergency situation where smoke or fire is present. -
Question:
Where should I install the BRK First Alert 9120BFF smoke detector?
Answer: The ideal locations for installing the BRK First Alert 9120BFF include hallways outside sleeping areas, on every level of your home, and in living rooms or family rooms. Smoke rises, so mount the detector high on the wall or ceiling as recommended. Proper installation maximizes its effectiveness in detecting smoke early, providing crucial time to address potential dangers. -
Question:
Does the BRK First Alert 9120BFF produce a loud alarm?
Answer: Yes, the BRK First Alert 9120BFF is designed to emit a loud alarm, typically around 85 decibels, which is intended to alert you and your family even during sleep. The loud and piercing sound is effective at ensuring that everyone in the home is awakened in the event of smoke detection. This is especially beneficial for larger homes where sound might need to travel greater distances. -
Question:
What does the indicator light on the BRK First Alert 9120BFF mean?
Answer: The indicator light on the BRK First Alert 9120BFF serves multiple functions, providing visual confirmation of its operational status. A steady green light indicates that the unit is functioning properly, while a red light alerts you to the presence of smoke or an error situation. Understanding these signals can help you maintain your smoke detector’s functionality and promptly address any issues. -
Question:
Is the installation of the BRK First Alert 9120BFF complicated?
Answer: The installation of the BRK First Alert 9120BFF is straightforward and can be completed with basic tools. It comes with a mounting bracket and requires hardwiring into your home’s electrical system, which may require a qualified electrician for safety. Simple installation ensures you can quickly set up this essential safety device in your home, enhancing your security against fire hazards. -
Question:
How long can I expect the BRK First Alert 9120BFF smoke detector to last?
Answer: The BRK First Alert 9120BFF is built with durability in mind and is designed to last up to 10 years under normal use. Regular maintenance, including testing and cleaning, can help preserve its functionality. Planning for periodic replacements is crucial for ensuring that your smoke detector continues to offer reliable protection against smoke and fire hazards. -
Question:
Where can I buy BRK First Alert 9120BFF SMI100-AC Smoke Detector in Malawi?
Answer: You can purchase the BRK First Alert 9120BFF SMI100-AC Smoke Detector on Ubuy in Malawi. Ubuy offers a convenient purchasing experience and a wide selection of safety devices like this smoke detector, ensuring you can find what you need for effective home safety.
BRK Smoke Detectors & Fire Alarms 9120B Editorial Review
The First Alert 9120B Smoke Detector is a hardwired alarm with a battery backup, making it a reliable choice for home safety. It is compatible with older models such as the BRK Model 4120B, allowing for easy replacement without the need for adapters. The smoke detectors can also be connected together, so when one goes off, they all go off, ensuring maximum safety in case of a fire. The unit comes with electrical pigtails and a battery, making installation hassle-free. The alarm can be tested by pressing and holding the button on the bottom of the unit. Customer reception of the First Alert 9120B Smoke Detector has been overall positive. Customers have praised the product for its good price and being exactly as described. The easy replacement process and compatibility with older models have also been appreciated. However, some customers have encountered issues with the battery life, with one customer mentioning that the battery needed replacement within two months. Overall, the First Alert 9120B Smoke Detector provides reliable smoke detection and is a convenient choice for those looking to replace their old smoke detectors.
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Pros
- Hardwired alarm with battery backup
- Compatible with older models, easy replacement process
- Can be connected together for maximum safety
- Comes with electrical pigtails and a battery
- Easy to test the alarm
Cons
- Battery life may be short
Platform Trust & Buyer Confidence
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Jazz
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“Easy to use and always helpful and sorts any issues I've had past and present”
1 September 2026 · via Trustpilot
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31 August 2026 · via Trustpilot
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“The delivery was fast and the product came undamaged and authentic.”
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“Fast, convenient and cheap. Great store!”
27 August 2026 · via Trustpilot
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- Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
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MWK 91366
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Features & Benefits
- Hardwired smoke alarm with battery backup
- Reliably detects smoke from hot, fast flaming fires
- Can integrate with up to 12 other First Alert or BRK hardwired alarms
- Features a latching indicator that identifies which unit triggered the alarm
- Smart technology to reduce nuisance alarms
- Includes mounting bracket that keeps the alarm secure over a wide rotation range
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