Universal Security Instruments MI106S Hardwired Smoke Alarm
- 10 year sealed battery, 87600 hours listed
- Hardwired alarm with permanent power backup
- Universal smoke sensing, fast-flaming and slow-smoldering fires
- Audible alarm, silver, 7.84 oz
- 10 year limited warranty
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A hardwired smoke and fire alarm with a sealed backup battery that needs no replacement over its life. It is a fit for a home that wants no low-battery chirps, but the listing says nothing about interconnect options.
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ASIN: B00NNX57YKModel: MI106SCategory: Smoke Detectors & Fire Alarms
Overview
A homeowner replacing an aging smoke alarm gets this USI Electric unit, which wires into house power and carries a sealed battery for outages. Its universal sensing is described as reading both fast-flaming and slow-smoldering fires, and a microprocessor aims to cut false alarms.
A sealed power cell takes away the routine battery swap and the low-battery chirp that wakes a household at night. The limit is that the battery is permanent: when it runs down, the whole alarm is replaced, and nothing in it mentions wireless linking or smart features.
Who it's for
Owners of homes with existing alarm wiring who dislike battery chores get a direct swap with built-in backup. Buyers with no hardwired alarm circuit, or those who want app alerts, should look elsewhere or ask an electrician.
Pros and cons
- Sealed battery needs no replacement
- Detects fast and smoldering fires
- Hardwired with outage backup
- Long limited warranty
- Interconnect options not listed
- Whole unit replaced when battery ends
- Wiring steps not given in listing
Performance notes
The sensing element reads smoke from both flaming and smoldering sources, and a microprocessor filters the readings to cut nuisance alarms from cooking or steam. House current runs the alarm day to day, and the sealed cell takes over during an outage so protection does not lapse. Detection time depends on where the alarm is mounted relative to the source of smoke.
Specifications
| Brand | Electric |
|---|---|
| Model | MI106S |
| Dimensions & fit | |
| Item weight | 7.84 ounces |
| Power & efficiency | |
| Power Source | Hardwired with sealed battery backup |
| Battery Average Life | 87600 hours |
| Construction & materials | |
| Color | Silver |
| Included components | |
| Unit Count | 1 Count |
| Warranty & support | |
| Manufacturer Warranty Description | 10 year limited warranty |
| Other details | |
| Sensor Type | Universal smoke sensing |
| Alarm | Audible |
| Product Style | Modern |
| Mfr Part Number | MI106S |
Frequently asked questions
How do I install the USI MI106S?
The listing says the alarm is hardwired and that permanent power lets you install and activate it, but it gives no wiring steps. Follow the manual and local code, or use an electrician.
Do I have to replace the battery in the MI106S?
No. The listing describes maintenance-free battery power with no low-battery chirps and no replacement batteries over the life of the alarm.
Does it work as a carbon monoxide alarm?
The listing describes a smoke and fire alarm only. It does not mention carbon monoxide detection.
Does the MI106S have smart or wireless features?
The listing does not mention wireless linking or an app. It calls itself a smart alarm only through its microprocessor intelligence.