First Alert SMCO100V-AC Plug-In Smoke and CO Alarm

The First Alert SMCO100V-AC Plug-In Smoke and CO Alarm delivers combination smoke and carbon monoxide detection in a uniquely convenient plug-in format — no wiring, no drilling, no mounting hardware required. Designed to plug directly into a standard 120V outlet with battery backup for power outage protection, the SMCO100V-AC provides code-compliant dual-hazard detection for renters, property managers, and homeowners who need reliable protection without the installation complexity or cost of hardwired systems. First Alert's combination plug-in design fills a real gap: comprehensive smoke and CO coverage in locations where hardwiring isn't practical and battery-only units present maintenance concerns.

Key Features

• Plug-in design — connects to any standard 120V outlet, no installation tools required
• Combination smoke and CO detection in a single unit
• Battery backup maintains protection during power outages
• No wall mounting, drilling, or electrical work required
• Renter-friendly — installs and removes without modifying the unit or structure
• Audible alarm with distinct smoke and CO alert patterns
• Test/silence button for routine testing and nuisance alarm management
• UL 217 (smoke) and UL 2034 (CO) listed
• LED status indicator for at-a-glance operational status

Specifications

Detailed Description

The First Alert SMCO100V-AC plug-in alarm solves a genuine installation problem: residents and property managers who need combination smoke and CO protection but cannot or prefer not to use hardwired units, and for whom battery-only units present the maintenance and reliability concerns that hardwired solutions are specifically designed to address. The plug-in format threads the needle — AC power from the outlet provides the primary supply that makes the unit more reliable than battery-only, while the battery backup ensures continued protection if the outlet loses power.

Renter applicability is one of the strongest use cases for the plug-in format. Renters cannot modify electrical systems, and in many jurisdictions, cannot drill into walls or ceilings without landlord permission. The SMCO100V-AC requires neither. It plugs into an outlet, sits or hangs from the outlet, and is operational immediately. When the renter moves, the alarm unplugs and travels with them — no fixtures left behind, no damage to the property. This combination of portability and code-compliant protection makes the SMCO100V-AC particularly valuable for renters in jurisdictions that require both smoke and CO alarms but where the landlord has not provided combination units.

The combination of smoke and CO detection in a single plug-in unit is a meaningful advantage over purchasing separate plug-in smoke and CO detectors. A single outlet serves both detection needs, preserving additional outlets for other uses and reducing the total number of devices to maintain. For properties where outlets are at a premium, consolidating detection into a single plug-in unit makes practical sense.

Battery backup is a critical feature for CO detection specifically. Carbon monoxide emergencies frequently occur during power outages — when generators are brought indoors, when gas appliances run continuously, or when heating systems malfunction during storms that also cause power failures. A CO alarm that loses power during a storm is precisely the unit that would be needed at that moment. The SMCO100V-AC's battery backup addresses this scenario directly, maintaining CO monitoring when the grid is down.

For property managers maintaining rental units where providing code-compliant smoke and CO coverage is required but hardwired installation across all units is cost-prohibitive or logistically complex, the plug-in format can represent a practical middle ground. Units can be provided to tenants for self-installation, reducing landlord maintenance labor while still meeting statutory requirements for combination smoke and CO alarm presence.

Compliance and Standards

• UL 217 — UL standard for smoke alarms; required for residential code compliance
• UL 2034 — UL standard for CO alarms; required in jurisdictions mandating CO detection
• NFPA 72 — Plug-in alarms with battery backup may satisfy residential requirements in many jurisdictions; verify local code acceptance of plug-in format
• Satisfies combination smoke/CO requirement with a single unit where both are mandated

Real-World Benefits

Renters gain portable, code-compliant smoke and CO protection they can install without landlord involvement or property modification. Property managers can provide combination protection without the cost or complexity of hardwired installation. Battery backup provides the CO monitoring most critical during the exact power-outage scenarios where CO risk peaks. Single-unit combination coverage consolidates two requirements into one device and one outlet.

Applications and Use Cases

• Rental apartments and units where hardwired installation is not permitted or practical
• Renters adding personal smoke and CO protection supplemental to landlord-provided units
• Temporary residences, extended-stay accommodations, and corporate housing
• Property managers providing portable combination detectors to tenants
• Home offices and basement workspaces with gas appliances nearby
• Vacation properties where renter-portable protection is desired

Related Products

• Fire Safety — Full Collection
• First Alert SC5 Hardwire Smart Smoke and CO Alarm (SMCO600NV-AC)

Frequently Asked Questions

Does the SMCO100V-AC need to be plugged in continuously?

Yes. The plug-in connection to a 120V outlet is the primary power source. The alarm should remain plugged in at all times during use. The battery backup is a failsafe for power outages, not an alternative primary power mode.

What type of outlet does the SMCO100V-AC require?

The SMCO100V-AC plugs into a standard 120V three-prong (grounded) outlet. It does not require a special outlet, GFCI, or dedicated circuit — any standard residential outlet will work.

Will the SMCO100V-AC block both outlet slots?

Plug-in alarm formats typically occupy one outlet position and may partially block the second. Check the product dimensions if outlet access is a concern at your intended installation location.

Does the plug-in format satisfy local code requirements?

Acceptance of plug-in format alarms varies by jurisdiction. Many local codes reference NFPA 72, which permits battery-powered and plug-in alarms with battery backup in residential structures. Verify with your local building or fire code authority if you have compliance questions specific to your location.

Can I use this alarm in a bedroom?

Yes, if a compatible outlet is accessible in the bedroom. NFPA 72 requires smoke alarms in every bedroom. The SMCO100V-AC installed in a bedroom outlet satisfies both smoke and CO detection requirements for that room where both hazards are present.

What backup battery does the SMCO100V-AC use?

Check the product documentation for the specific battery type. Common backup batteries for plug-in alarms are 9V alkaline or AAA cells. Replace the backup battery per the manufacturer's recommended schedule to ensure backup protection is available during power outages.

How does plug-in CO detection compare to hardwired?

Both plug-in (with battery backup) and hardwired alarms provide AC power with battery backup — the key feature that makes them more reliable than battery-only units. Hardwired alarms additionally interconnect with other alarms in the structure, which plug-in units typically do not. For installations where interconnection is required by code, hardwired units are the appropriate choice.