First Alert SMCO100V-AC Hardwire Smoke and CO Alarm with Voice
- Power Source: Corded Electric
- Alarm: Smoke And CO Alarm
- Product Style: Precision Detection
- Item Weight: 0.7 pounds
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A two-function hardwired alarm worth considering when replacing an aging hardwired smoke-only unit where CO coverage is also wanted in that spot.
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ASIN: B0CV553YL4Model: SMCO100V-ACCategory: Smoke Detectors & Fire Alarms
Overview
Hardwired combination smoke and carbon monoxide alarm from First Alert with voice alerts that announce the type and location of the danger, running on AA battery backup and a quick-connect plug for installation.
This combines two functions, smoke and CO, in a single hardwired unit, and adds spoken alerts on top of the standard tone so occupants are told what is wrong and roughly where, rather than working it out from beep counts. The Quick Connect Plug is meant to simplify swapping an existing hardwired alarm without rewiring the junction box.
- Combination smoke and CO detection
- Voice and location alerts
- Quick Connect Plug for rewiring-free swaps
- AA battery backup
Who it's for
Households upgrading a hardwired smoke alarm to also cover carbon monoxide in one unit, particularly anyone who wants clearer spoken guidance during an actual emergency rather than a beep code.
Pros and cons
- Covers smoke and carbon monoxide in one hardwired unit
- Voice alerts announce hazard type and location
- Quick Connect Plug simplifies swapping an existing hardwired alarm
- Interconnects with compatible alarms
- Hardwired install, not a plug-in or battery-only option
Performance notes
Voice and location alerts identify whether the hazard is smoke or carbon monoxide and roughly where it originated, adding information a plain tone alarm can't give. The Quick Connect Plug is meant to let the alarm swap onto existing hardwired alarm wiring without an electrician rewiring the box. Precision Detection sensing targets the same cooking-nuisance-alarm reduction as First Alert's smoke-only models.
Specifications
| Brand | First Alert |
|---|---|
| Model | SMCO100V-AC |
| Dimensions & fit | |
| Item Weight | 0.7 pounds |
| Item Dimensions D X W X H | 5.1 × 5.1 × 2.4 inches |
| Power & efficiency | |
| Power Source | Corded Electric |
| Construction & materials | |
| Color | White |
| Included components | |
| Unit Count | 1 |
| Other details | |
| Alarm | Smoke And CO Alarm |
| Product Style | Precision Detection |
| Number Of Items | 1 |
| Mfr Part Number | 1046778 |
| Builtin Media | AA Batteries, Easy Adapter Plug |
| Item Type Name | Smoke And CO Alarm |
| Item Highlight | SMCO100V-AC, AA Battery Backup |
Frequently asked questions
Does this alarm detect both smoke and carbon monoxide?
Yes, it's a combination hardwired smoke and CO alarm per the title and spec sheet.
What does the voice alert tell me?
It announces the type of danger detected and its general location to help with evacuation.
Do I need to rewire my junction box to install it?
First Alert's Quick Connect Plug is built to let it swap onto existing hardwired alarm wiring without rewiring.