First Alert SMI100 Ionization Smoke Alarm — Battery Operated

The First Alert SMI100 Smoke Alarm provides reliable residential smoke detection in an affordable, straightforward battery-operated package — making it a practical solution for property managers outfitting rental units, homeowners adding coverage to previously unprotected areas, and any application where meeting smoke alarm code requirements with a dependable name-brand product is the priority. First Alert is one of the most widely recognized brands in residential fire safety, and the SMI100 reflects the brand's commitment to basic, functional smoke detection for everyday residential needs.

Key Features

• Residential smoke detection from a trusted, widely recognized brand
• Battery-operated — no wiring required for installation
• Audible alarm meets residential code requirements for sound output
• Test button for routine monthly testing per NFPA 72 recommendations
• LED status indicator confirms operational status
• Compact design fits standard ceiling and wall mounting locations
• Easy installation with included mounting hardware
• Cost-effective option for multi-unit or whole-home coverage

Specifications

Detailed Description

The First Alert SMI100 occupies the practical entry tier of residential smoke alarm products — straightforward detection, battery operation, and the brand reliability that property owners, tenants, and inspectors recognize. For applications where the requirement is basic: meet code, provide audible detection, and do so at a price point that makes whole-home or multi-unit coverage feasible, the SMI100 delivers without unnecessary complexity.

Battery operation is a significant installation advantage in residential contexts. No electrical work, no coordination with contractors, no junction box — the SMI100 mounts with screws included in the package and is operational as soon as the battery is installed. This makes it accessible to renters, homeowners, and property managers who need to bring units into compliance quickly and without trade labor costs. The 9V battery is widely available, and the low-battery alert notifies occupants when replacement is needed before the alarm loses function.

First Alert has been manufacturing smoke alarms since the early days of the residential detector market, and the brand recognition matters in the rental and property management context. Tenants recognize the name, inspectors are familiar with the products, and property managers can confidently specify First Alert units knowing they meet the UL 217 listing requirement that most local codes reference.

For landlords managing compliance across a portfolio of rental units — particularly in jurisdictions that have specific requirements for smoke alarm presence in every bedroom, outside sleeping areas, and on every floor — the SMI100 provides a cost-effective per-unit option that satisfies those placement requirements without committing to premium smart or hardwired products in every location. Hardwired units may be appropriate for long-term installations where battery maintenance is a concern, but for situations where straightforward compliance is the goal, the SMI100 is a practical tool.

Monthly testing with the test button is recommended by NFPA 72, and annual battery replacement ensures the unit remains operational throughout its service life. As with all smoke alarms, units should be replaced at the manufacturer's recommended end-of-life interval — typically 10 years from date of manufacture, stamped on the unit.

Compliance and Standards

• UL 217 — UL standard for smoke alarms; required for residential code compliance in most U.S. jurisdictions
• NFPA 72 — Specifies smoke alarm placement in every bedroom, outside each sleeping area, and on every floor of a residential dwelling
• Meets requirements for rental property compliance in jurisdictions mandating smoke alarms in rental units

Real-World Benefits

Property managers gain a code-compliant, name-brand smoke alarm at an entry-level price point suitable for bulk purchasing across a rental portfolio. Homeowners adding coverage to secondary rooms or replacing expired units get reliable detection without the cost of premium models. The battery-operated design requires no electrical work, keeping installation simple and fast. First Alert's brand recognition satisfies tenant expectations and inspection requirements without explanation.

Applications and Use Cases

• Rental property smoke alarm compliance installations
• Replacing expired or non-functional smoke alarms in existing homes
• Adding coverage to secondary bedrooms, hallways, or basement areas
• Entry-level residential installations for new homeowners
• Vacation property and secondary home installations
• Temporary structures or seasonal occupancy buildings requiring basic code compliance

Related Products

• Fire Safety — Full Collection
• Kidde Photoelectric Smoke and CO Detector with Voice Alerts

Frequently Asked Questions

What type of smoke sensing does the First Alert SMI100 use?

Contact WC Safety or refer to the product packaging for the specific sensing technology (ionization or photoelectric) of the SMI100. The detection type affects optimal placement — ionization is faster on flaming fires, photoelectric is faster on smoldering fires.

How long does the battery last in the SMI100?

A standard 9V alkaline battery typically provides 12 months of operation under normal conditions. The SMI100 will emit a low-battery chirp (a short beep at regular intervals) when battery replacement is due. Replace promptly to maintain protection.

Where should I install the SMI100?

Per NFPA 72, smoke alarms should be installed in every bedroom, outside each sleeping area (such as a hallway adjacent to bedrooms), and on every level of the home including the basement. Mount on the ceiling or high on a wall, at least 4 inches from any corner.

How do I stop the low-battery chirp?

Replace the 9V battery. After replacement, press the test button to reset the alarm and confirm normal operation. If chirping continues after battery replacement, the unit may be at end of life and should be replaced.

When should I replace my smoke alarm?

Smoke alarms should be replaced 10 years from the date of manufacture, which is printed on a label on the back of the unit. Even if the alarm appears to function, the sensing chamber degrades over time and may not detect smoke reliably after 10 years.

Can the SMI100 be interconnected with other alarms?

Battery-only smoke alarms generally do not support interconnection. For multi-alarm interconnection (where all alarms sound when one detects smoke), hardwired or RF-wireless interconnectable models are required.

Is the SMI100 appropriate for garage installation?

Smoke alarms are not recommended for direct garage installation due to vehicle exhaust and humidity that can cause nuisance alarms. NFPA 72 recommends placement inside the door connecting the garage to the living area rather than inside the garage itself.