First Alert
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First Alert BRK 9120B/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack
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First Alert BRK 9120B/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack
Stay protected with the First Alert BRK 9120B, featuring tamper-resistant pins and a loud 85dB alarm!
First Alert BRK 9120B/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack
Item #: 90950429

First Alert BRK 9120B/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack

Item #: 90950429

BTN 6331

Price Details

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*All items will import from US

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Order now and get it around Tuesday, August 18
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Stay protected with the First Alert BRK 9120B, featuring tamper-resistant pins and a loud 85dB 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

Hardwired System
The First Alert BRK 9120B is hardwired for reliability, ensuring constant power supply during emergencies while reducing the need for frequent battery replacements.
Battery Backup
Equipped with a battery backup, this smoke alarm guarantees continued operation even during power outages, providing additional peace of mind for your family's safety.
Smart Design
Featuring a sleek, modern design, the First Alert BRK 9120B seamlessly integrates into any home decor while offering advanced smoke detection technology to enhance overall protection.

Product Details

Shop First Alert BRK 9120B/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack online at a best price in Bhutan. B078HGZ54S
Power SourceBattery Powered, Corded Electric
Sensor TypeIonization
Product Style3 Units (9120B)
Color3 Units (9120B)
Item Weight16 ounces (453.6 grams)
BrandFirst Alert
Model Number9120B
Unit Count3 Count
Number of Items1
ManufacturerFirst Alert
UPC029054246707
Mfr Part NumberSMI100-AC
Style3 Units (9120B)

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?

Suitable For
  • Homeowners

    Ideal for homeowners seeking reliable smoke detection with hardwired options and battery backup for added safety.

  • Landlords

    Perfect for landlords wanting to ensure tenant safety with effective smoke alarms that meet regulatory standards.

  • Families

    A great choice for families needing dependable smoke alarms to protect children and loved ones from fire hazards.

Not Suitable For
  • Renters

    Not suitable for renters in apartments where installation of hardwired alarms is restricted or disallowed.

Product Description

First Alert BRK 9120B/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack

Have any Query? Chat with us

Customer Questions & Answers

  • Question: What are the key features of the First Alert BRK 9120B Hardwired Smoke Alarm?

    Answer: The First Alert BRK 9120B Smoke Alarm comes with both hardwired and battery backup options, ensuring reliable performance even during power outages. It features an ionization smoke sensing technology that responds quickly to fast-flaming fires. Additionally, it includes a tamper-resistant design to prevent unauthorized removal, a 85-decibel alarm, and a convenient test/silence button. This smoke alarm is ideal for ensuring safety in homes and buildings, providing peace of mind with its dependable continuous monitoring and easy installation.
  • Question: How do I install the First Alert BRK 9120B Hardwired Smoke Alarm?

    Answer: Installation of the First Alert BRK 9120B is straightforward. You’ll need standard electrical tools to connect the smoke alarm to your home’s electrical system. The unit comes with a mounting bracket that can be attached directly to your ceiling or wall. Ensure to follow the included instructions for wiring the device securely. For best results, install smoke alarms in every bedroom and on each floor of your home, enhancing safety by creating a comprehensive smoke detection network.
  • Question: What is the importance of having a battery backup in a smoke alarm?

    Answer: Having a battery backup is crucial in a smoke alarm as it ensures continuous operation during power outages. The First Alert BRK 9120B features a backup battery that kicks in when electrical power is lost, providing an additional layer of safety. This is especially important during emergencies when smoke alarms can be the first line of defense against fire. Regularly testing and replacing the backup battery can enhance the reliability of the device and ultimately contribute to your home's safety.
  • Question: What maintenance is required for the First Alert BRK 9120B Smoke Alarm?

    Answer: Routine maintenance for the First Alert BRK 9120B smoke alarm is important for its effectiveness. You should test the alarm monthly using the test button, and clean the unit regularly with a vacuum or a soft cloth to remove dust and debris. Replace the backup battery at least once a year to ensure functionality. If the alarm emits a chirping sound, it's an indication that maintenance is needed, either through cleaning or battery replacement, ensuring that it remains reliable in alerting you during emergencies.
  • Question: How does the First Alert BRK 9120B handle false alarms?

    Answer: The First Alert BRK 9120B smoke alarm features a convenient silence button that allows you to temporarily disable the alarm in case of false alarms, such as cooking smoke. This feature is handy for reducing disturbances while maintaining safety during genuine emergencies. It will automatically reset itself after a short period, ensuring you are still protected. For persistent false alarms, consider relocating your smoke alarm away from kitchens or bathrooms, which are common sources of non-threatening smoke.
  • Question: Can the First Alert BRK 9120B be interconnected with other smoke alarms?

    Answer: Yes, the First Alert BRK 9120B is designed to be interconnected with other compatible smoke alarms. This means when one unit detects smoke, all interconnected alarms sound simultaneously, providing optimal safety across larger areas such as multi-level homes. This interconnected feature allows for immediate notification in any part of the house, enhancing the alert's reach and ensuring everyone can respond quickly to potential danger.
  • Question: What kind of smoke does the First Alert BRK 9120B detect?

    Answer: The First Alert BRK 9120B utilizes ionization technology, making it particularly effective at detecting fast-flaming fires that produce minimal smoke. This includes fires caused by flammable liquids or paper. For optimal safety, consider placing this smoke alarm in areas where such fires are more likely to occur, such as near kitchens or living rooms. For comprehensive protection, pairing it with a photoelectric smoke alarm can enhance detection of smoldering fires.
  • Question: What is the lifespan of the First Alert BRK 9120B smoke alarm?

    Answer: The First Alert BRK 9120B smoke alarm is designed for a lifespan of approximately 10 years. After this time, it is essential to replace the alarm to ensure reliable performance. Regularly checking the manufacturing date found on the unit can help you keep track of its lifespan. Proper replacement is key, as older smoke alarms may not function correctly, reducing safety in your home during emergencies.
  • Question: Is the First Alert BRK 9120B compatible with my home's electrical system?

    Answer: Yes, the First Alert BRK 9120B is compatible with most standard household electrical systems, usually requiring a 120V power source. It also has a 9V battery backup for reliable operation during outages. Ensure to check your existing wiring and follow the installation instructions closely for proper configuration. If there are any specific concerns about compatibility, consulting a qualified electrician prior to installation can provide additional assurance.
  • Question: Where can I buy the First Alert BRK 9120B Hardwired Smoke Alarm with Battery Backup?

    Answer: You can conveniently purchase the First Alert BRK 9120B Hardwired Smoke Alarm with Battery Backup from Ubuy in Bhutan. Ubuy offers a selection of smoke alarms to ensure your home is equipped with the necessary safety measures. Their platform makes it easy to find reliable products that best fit your needs while also providing detailed product descriptions and customer feedback to guide your purchase.

First Alert Smoke Detectors & Fire Alarms 9120B Editorial Review

The First Alert BRK 9120B Hardwired Smoke Alarm with Battery Backup is generally well-received by customers, praised for its ease of installation and reliability. Many reviewers highlight the simple installation process, often completing the task in under 30 minutes. The compatibility of new alarms with existing wiring eases the transition from older models. Customers appreciate the peace of mind offered by the hardwired system, coupled with battery backup functionality, which ensures continued operation even during power outages. Despite the favorable reviews, some users experienced issues with false alarms, particularly when cooking, prompting some to express frustration with the product's sensitivity. While many users commend the smoke alarms for their durability, noting they've lasted well over a decade in some cases, they also point out that the battery life can be shorter than expected. Overall, the First Alert BRK 9120B is a solid choice for those looking for reliable smoke alarms, but potential buyers should be aware of possible false alarms based on their specific home environments. **

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Pros

  • Easy installation, often completed in under 30 minutes.
  • Compatibility with existing wiring, reducing installation hassle.
  • Hardwired with battery backup for continued operation during power failures.
  • Many users report long lifespan (over a decade).
  • High quality, generally dependable performance.

Cons

  • Some users experienced false alarms, especially during cooking.

Platform Trust & Buyer Confidence

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Mohammad
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“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”

23 July 2026 · via Trustpilot
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“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”

22-Jul-26 · via Trustpilot
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“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”

23-Jul-26 · via Trustpilot
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Onesi
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“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”

22 July 2026 · via Trustpilot
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“Ubuy is a great online platform to buy stuff. Reliable, fast delivery time and great value for money. I've been using Ubuy online shopping platform for three years now and will continue to do so.”

23 July 2026 · via Trustpilot
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Important information

  • 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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BTN 6331

Order now and get it around Tuesday, August 18

QTY:

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Fastest cross-border delivery

Features & Benefits

  • Hardwired smoke alarm with reliable battery backup.
  • Tamper-resistant locking pins for added security.
  • Single button for easy silence and test.
  • Loud 85dB alarm for effective warning.
  • Continues to function during power outages.
  • Essential safety device for every household.

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