- Home Page /
- Tools & Home Improvement /
- Safety & Security /
- Fire Safety /
- Smoke Detectors & Fire Alarms /
- First Alert Hardwire Smoke Alarm | SMI100-AC,...
0 ratings
Item #:
109011301
First Alert Hardwire Smoke Alarm | SMI100-AC, 9V Battery Backup
Item #:
109011301
NZD 215
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
*All items will import from US
Afterpay Information
Split your bill into 4 payments of NZD 53.75 interest-free
Add the item to your cart
Select Afterpay at checkout
Fill in your details
Complete your first payment
and pay the remaining in easy instalments or according to the payment plan you selected
Here’s why you should Afterpay it
Get everything you need now..
Shop thousands of brands and millions of products, online and in-store.
Pay over six weeks.
Make the first payment upfront and the rest over time. Always interest-free when you pay it in 4.
No fees when you pay on time.
We’ll send you reminders and cap late payments to help you get back on track.
(1) Terms and conditions. apply. (2) Installment Agreement. (3) Eligible for customers in. New Zealand, (4) Your final payment plan may vary depending on your credit history.
In stock
Imported from USA store
QTY:
Order now and get it around Thursday, September 10
Secured transaction
Ubuy works hard to protect your security and privacy. Our advanced payment security system ensures confidentiality by encrypting your information during transmission using AES (Advanced Encryption Standards) and SSL (Secure Socket Layer) protocols. Your payment details are 100% secure as we do not share your payment details with third party sellers.
Our Top Logistics Partners
Utilizing First Alert's Precision Detection advance sensing technology, this hardwire smoke alarm provides early warning and easy installation without the need to rewire.
Buy Now Pay Later
Fast
Shipping
Free
Return*
Secure Packaging
100% Original Products
PCI DSS Compliance
ISO 27001 Certified
Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.
What Stands Out
Hardwire Interconnect
This smoke alarm connects with other units, enhancing safety by ensuring all alarms sound simultaneously, alerting you faster to smoke or fire, even in larger homes.
Battery Backup
Equipped with a reliable battery backup, this alarm ensures continued functionality during power outages, providing peace of mind and constant protection for your family.
6-Pack Value
The 6-pack provides excellent value for comprehensive coverage in every room of your home, ensuring safety where you need it most without breaking the bank.
Product Details
| Brand | First Alert |
| Model Number | SMI100-AC |
| Global Trade Identification Number | 30194160015538 |
| Number of Items | 1 |
| Manufacturer | First Alert |
| Built-In Media | Adapter Plug |
| Item Type Name | Smoke Alarm |
| Mfr Part Number | FSMI100ACSI6 |
| Power Source | Corded Electric |
| Alarm | Audible |
| Product Style | Precision Detection |
| Color | White |
| Item Dimensions D x W x H | 21.63"D x 3.81"W x 15"H (54.9 x 9.7 x 38.1 cm) |
| Item Weight | 16 ounces (453.6 grams) |
| Style | Precision Detection |
| Product Dimensions (L x W x H) | 21.63"D x 3.81"W x 15"H (54.9 x 9.7 x 38.1 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?
-
Homeowners
Ideal for homeowners needing reliable smoke detection systems throughout their property for enhanced safety and protection.
-
Large Families
Perfect for families living in larger homes, providing comprehensive coverage with interconnectivity among multiple alarms.
-
Landlords
Suitable for landlords who need to ensure safety compliance in rental properties with robust smoke alarm systems.
-
Small Apartments
Individuals in small apartments might find this six-pack excessive for their space and needs.
Product Description
Have any Query? Chat with us
Customer Questions & Answers
-
Question:
What is the difference between hardwired and battery-operated smoke detectors?
Answer: Hardwired smoke detectors, like the First Alert 9120B, connect directly to your home's electrical system and offer continuous power. Battery-operated models rely solely on batteries that may require changing. Hardwired units are more reliable since they eliminate the risk of dead batteries. However, First Alert 9120B includes a battery backup feature, ensuring functionality even during power outages. For example, in an emergency during a blackout, the detector will still alert you, providing an extra layer of safety. -
Question:
How do I install the First Alert 9120B smoke detector?
Answer: Installation of the First Alert 9120B is straightforward. Begin by selecting a location on the ceiling or high on the wall, away from corners. Use the included mounting bracket to secure it in place and connect the hardwired wiring according to the manual. Remember to test the detector once installed. Proper installation height is crucial for optimal functionality, such as placing it 4 to 12 inches from the wall, as smoke rises and can trigger the alarm more effectively. -
Question:
Can I interconnect multiple First Alert 9120B alarms?
Answer: Yes, multiple First Alert 9120B smoke detectors can be interconnected. This means when one alarm detects smoke or carbon monoxide, all interconnected units will sound an alarm, enhancing alertness throughout your home. This is particularly beneficial in larger residences where alarms in different rooms provide comprehensive coverage. For instance, if an alarm in the basement is triggered, you can hear it in bedrooms upstairs, ensuring that everyone is alerted regardless of their location. -
Question:
What is the battery backup duration for the First Alert 9120B?
Answer: The battery backup in the First Alert 9120B is designed to provide reliable power during outages, typically lasting several hours to over a year, depending on the battery type used. The unit comes with a 9-volt battery already included but requires regular testing and maintenance. It’s recommended to change the backup battery at least once a year to ensure that the smoke detector remains fully operational. This feature grants peace of mind, knowing your detector can function even when the power is out. -
Question:
How often should I test my First Alert 9120B smoke detector?
Answer: It's crucial to test your First Alert 9120B smoke detector at least once a month to ensure it is functioning properly. Use the test button on the unit, which will create a loud alarm sound when pressed. Additionally, replace the batteries annually and consider replacing the entire smoke detector every 10 years for optimal safety. Regular testing helps detect malfunctions early, so you can replace the unit before it fails to alert you in case of smoke or fire. -
Question:
What are the key features of the First Alert 9120B?
Answer: The First Alert 9120B smoke detector boasts several key features such as hardwired operation with battery backup, a photoelectric sensor for quick smoke detection, an easy-to-remove battery compartment, and an end-of-life signal that alerts you when it’s time to replace the unit. The photoelectric sensor is particularly effective for detecting smoldering fires, making it ideal for homes where such risks are prevalent. Additionally, the three-pack option offers great value, providing coverage for multiple rooms in one purchase. -
Question:
What types of fires does the First Alert 9120B smoke detector detect best?
Answer: The First Alert 9120B features a photoelectric sensor, which excels at detecting smoldering fires that produce larger smoke particles, such as those caused by upholstered furniture or electrical malfunctions. This detection type minimizes false alarms triggered by cooking smoke or steam. It's particularly suitable for areas near kitchens or living spaces where such fires are more common. Pairing it with ionization smoke detectors can provide comprehensive protection, covering both flaming and smoldering fires effectively. -
Question:
Are First Alert smoke detectors suitable for use in homes with pets?
Answer: Yes, First Alert smoke detectors, including the 9120B model, are suitable for homes with pets. The photoelectric sensor reduces the likelihood of false alarms from cooking, enabling a safer environment. However, it's essential to place detectors away from common pet activities, such as feeding areas or where smoke may arise from cooking. This way, alarms will function effectively without unnecessary disruptions. They are also sensitive enough to alert you quickly in case of an emergency, ensuring everyone's safety, including your pets. -
Question:
Do I need a professional installation for the First Alert 9120B?
Answer: While some homeowners opt for professional installation, the First Alert 9120B is designed for DIY installation. Following the included manual makes it accessible for most users. However, if you are uncomfortable with electrical work or local building codes require professional installation, hiring an electrician may ensure compliance with regulations. For instance, if you own an older home with complicated wiring, it may be safer to consult an expert, ensuring that installation is both safe and effective. -
Question:
Where can I buy First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack?
Answer: You can purchase the First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack through Ubuy in New Zealand. Ubuy offers a wide selection of home safety products, ensuring you get authentic items delivered right to your doorstep. With Ubuy, you can also enjoy various shipping options and customer service support to assist you in making a confident purchase decision.
First Alert Smoke Detectors & Fire Alarms SMI100-AC Editorial Review
The First Alert SMI100-AC smoke alarm set has garnered positive reviews from customers who appreciate its easy installation and effective functionality. Reviewers have noted that the smoke detectors were simple to replace, fitting seamlessly into existing junction boxes, with many mentioning the inclusion of a wiring pigtail that facilitated the transition from older models. Users have found the smoke alarms to be reliable, frequently highlighting their ability to communicate effectively with one another when tested. Many Consumers were initially skeptical, especially after experiencing issues with older detectors that would alarm unexpectedly. However, since switching to the First Alert SMI100-AC, they report no such problems, noting that the alarms have been Consistently dependable. The presence of battery backup has also been appreciated, enhancing the reliability of these devices. With excellent instructions and LED indicators, customers affirm that the installation process was straightforward, and they feel assured that the alarms are functioning correctly. Overall, the First Alert SMI100-AC smoke alarms are well-received for their user-centric design, reliability, and value for money, making them a recommendable option for anyone looking to upgrade their smoke detection system. **
Customer Reviews & Ratings
2500 customers ratings
-
5 Star
80%
-
4 Star
9%
-
3 Star
5%
-
2 Star
1%
-
1 Star
5%
Review this product
Share your thoughts with other customers
Pros
- Easy installation compatible with standard junction boxes.
- Reliable communication between units during testing.
- Battery backup enhances reliability.
- Clear instructions provided for installation.
- LED indicators confirm device functionality.
- Good value for the features offered.
Cons
- Some users needed to adapt wiring from older models.
Platform Trust & Buyer Confidence
RA
Ranee
Verified buyer
“Paint ordered from USA, u buy got the product to me in New Zealand in approx a week”
22 July 2026 · via Trustpilot
NC
NordVPN
Verified buyer
“very speedy delivery,tracking info was superb-best experikence ever!!!”
24 June 2026 · via Trustpilot
NH
Nicholas
Verified buyer
“Love what I received and ordered found that usa clothes are more better quality and look better than the same clothes in my country but are harder to find here recommend ubuy 100%”
22 June 2026 · via Trustpilot
D
Dneah
Verified buyer
“Product came earlier than expected (shipped from US to NZ), in about 3 weeks. No damages and product was exactly as advertised!”
15-Jul-26 · via Trustpilot
TS
Tania
Verified buyer
“Easy to order, easy to track and the product is great to use. Also, the person-to-person (not automated) phone call I got to confirm that I'd received the item was wonderful ??”
11-Jul-26 · via Trustpilot
Secure Checkout
Global Delivery
Easy Returns
Genuine Products
Product Price History
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.
- Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.
NZD 215
Order now and get it around Thursday, September 10
This item is not restrict in my country.(Please click on above link if this item is not restrict in your country, So our team will review and allow.)
QTY:
Secured transaction
PCI DSS compliant and ISO 27001:2022 certified, with encrypted payments and full buyer protection on every order.
Our Top Logistics Partners
Fastest cross-border delivery
Features & Benefits
- Easy to install and replace, no rewiring needed.
- Interconnect compatible for whole home alarm systems.
- Precision Detection technology reduces nuisance alarms.
- Provides early warning during a home fire emergency.
- Battery backup ensures protection during power outages.
- Visual alarm indicator shows which unit initiated the alarm.
Ubuy Assurance
Experience worry-free shopping with 100% original products, PCI DSS-compliant payment security, ISO 27001-certified data protection, the fastest cross-border delivery, free returns *, and secure packaging on every order.