First Alert 10-Year Battery Battery-Operated Photoelectric Smoke Detector 2-Pack – Model 1046736

The First Alert photoelectric smoke detector (Model 1046736, 2-pack configuration) is the maintenance-free residential fire safety device that combines two meaningful upgrades over standard smoke alarms: photoelectric sensing technology and a sealed 10-year lithium battery. As a 10 year battery smoke detector, the First Alert photoelectric smoke detector eliminates the battery replacement step that most homeowners skip, with the sealed lithium battery providing continuous power for a full decade of operation. As a First Alert 1046736 model, this is the specific SKU that has become the standard 2-pack format that home goods retailers stock for replacement and new construction. As a battery operated smoke alarm 2 pack, the configuration provides immediate coverage for two areas of the home without any wiring work, electrician visit, or panel modification. As a sealed lithium battery smoke detector, the unit complies with state and local laws (now in effect in many US states) requiring sealed 10-year battery smoke alarms in new and replacement installations. Every First Alert photoelectric smoke detector ships nationwide from IB Lighting with free shipping. Manufacturer specifications are available at the official First Alert website.

First Alert Photoelectric Smoke Detector Key Highlights

Photoelectric Sensing Technology: Why It Matters for Real Home Fires

The defining feature of the First Alert photoelectric smoke detector is the photoelectric sensing technology itself. Smoke detectors come in two main sensor types: photoelectric (this product) and ionization. Both detect smoke, but they detect different types of smoke from different fire profiles. The choice between them has meaningful real-world consequences for which fires get detected early enough to give occupants time to escape.

Photoelectric sensors detect smoke by shining a beam of light through a chamber and watching for light scatter when smoke particles enter the chamber. They are especially sensitive to the larger smoke particles produced by slow, smoldering fires: smoldering mattresses or upholstered furniture, smoldering electrical wiring inside walls, smoldering food on a stove that never fully ignites. These slow smoldering fires are responsible for the majority of residential fire deaths because they produce dangerous levels of carbon monoxide and toxic smoke long before they produce visible flames, and they typically start at night when occupants are sleeping.

Ionization sensors detect smoke through a different principle and are more sensitive to the small smoke particles produced by fast-flaming fires (cooking flame-ups, paper fires, fast-spreading flame fronts). Ionization alarms tend to give more frequent nuisance alarms from cooking and shower steam, which leads many homeowners to disable them.

The National Fire Protection Association (NFPA) recommends both types in residential installations for complete coverage. If you can only have one type, photoelectric detectors are the type most fire safety experts recommend installing in bedrooms and sleeping areas, where the slow-smoldering fire risk is highest and where occupants need the earliest possible warning. The First Alert photoelectric smoke detector specifically targets this critical sleeping-area protection.

The 10 Year Battery Smoke Detector Advantage: Why Sealed Lithium Wins

The most important practical feature of the First Alert photoelectric smoke detector is the sealed 10-year lithium battery. This is a fundamental upgrade over traditional 9V replaceable-battery smoke alarms, and the upgrade addresses the single biggest failure mode of residential smoke alarms: dead batteries.

National Fire Protection Association data consistently shows that the leading cause of smoke alarm failure during residential fires is missing or dead batteries. Traditional 9V battery smoke alarms require annual battery replacement, but homeowners routinely forget, ignore the low-battery chirp warning, or remove the battery to silence nuisance alarms and never reinstall it. By the time a real fire happens, the alarm does not have power to alert occupants.

The sealed 10-year lithium battery in the First Alert photoelectric smoke detector eliminates this failure mode entirely for a full decade. The battery cannot be removed because the housing is permanently sealed. The unit cannot have its battery die early because the lithium chemistry is engineered specifically for the 10-year service life under continuous monitoring duty. The unit cannot be silenced by battery removal because there is no removable battery. When the 10-year service life ends, the entire unit is replaced (not the battery), at which point the photoelectric sensor and electronics are also fresh.

The economic case for sealed 10-year units is straightforward. A traditional 9V alarm costs less upfront but requires 10 batteries over its useful life, plus the cost of any flame damage if a battery happens to be dead during an actual fire. The First Alert photoelectric smoke detector eliminates the battery replacement schedule entirely. The total cost of ownership over a decade is similar or lower, with meaningfully better protection because the alarm is guaranteed to have power throughout.

Why a 2-Pack Is the Right Format

The First Alert photoelectric smoke detector ships as a 2-pack for a specific reason: most residential installations need multiple detectors, and buying multiple units at once at a per-unit price discount is the practical reality of how homeowners actually deploy smoke alarms throughout a house. The National Fire Protection Association recommends installing a smoke alarm in every bedroom, outside each sleeping area, and on every level of the home including basements. For a typical 3-bedroom single-family home, this works out to at least 5 to 6 detector locations.

The 2-pack format from this First Alert photoelectric smoke detector listing covers two of those locations for one purchase. Most homeowners purchase 2 to 3 of these 2-packs to cover a complete single-family home replacement cycle. For new construction or whole-house upgrades, that math scales accordingly. The 2-pack pricing is meaningfully better per-unit than buying single units, and the bulk purchase incentivizes whole-house coverage rather than the partial coverage that leaves protection gaps.

For landlords and property managers running smoke alarm replacements on rental units, the 2-pack format suits the typical 1-bedroom or 2-bedroom apartment unit replacement scope. Multi-unit property managers ordering for many apartments at once should contact the IB Lighting team for volume pricing on case-quantity orders.

Battery Operated vs Hardwired: Why Battery-Operated Often Wins for Replacement

The First Alert photoelectric smoke detector is battery operated, which means it mounts directly to the ceiling with the included hardware and does not require any wiring connection to household power. This is the right choice for several common scenarios where hardwired alarms would be more expensive or impossible to install.

For replacement of existing battery-operated alarms in older homes, the First Alert photoelectric smoke detector is a direct swap. Unscrew the old unit, mount the new one in the same location, done in five minutes per detector. No permits, no electrician, no drywall repair. For new alarm locations in homes that did not originally have detectors in certain rooms (older homes especially), battery-operated alarms add coverage without the labor and cost of running new wiring through finished walls and ceilings.

Hardwired smoke alarms have advantages of their own, particularly the ability to interconnect (when one alarm trips, all alarms in the home trip) and continuous household power without battery dependence. Hardwired alarms are required in many jurisdictions for new construction. But hardwired alarms also require electrician installation, panel space for the dedicated circuit (typically a 15-amp arc-fault breaker), and meaningful labor cost. For most replacement and add-on scenarios in existing homes, the battery-operated First Alert photoelectric smoke detector is the right balance of safety, ease, and cost.

For new construction or remodels where wiring is being run anyway, the IB Lighting electrical wire collection stocks 14/2 NM-B Romex for the dedicated smoke alarm circuit, which is the most common cable specification for hardwired residential smoke alarm wiring.

Where to Install the First Alert Photoelectric Smoke Detector in Your Home

The National Fire Protection Association (NFPA) and the International Residential Code (IRC) both specify smoke alarm location requirements that the First Alert photoelectric smoke detector is designed to satisfy. Following these placement guidelines maximizes the detector’s ability to provide early warning regardless of where in the home a fire originates.

Install one detector inside every bedroom in the home. This is the most critical location because most residential fire deaths occur to occupants who were sleeping when the fire started. A detector inside the bedroom wakes the occupants directly, even if the bedroom door is closed (which is recommended for fire containment).

Install one detector outside each separate sleeping area, in the hallway connecting bedrooms to the rest of the home. This catches smoke spreading from non-bedroom locations and provides early warning before the smoke reaches the bedrooms themselves.

Install at least one detector on every level of the home, including basements (finished or unfinished) and attics if used for storage. Multi-level homes should have at least one detector on each level, mounted in central hallway or stairway locations where smoke from any room on that level will reach the alarm quickly.

Avoid installing the First Alert photoelectric smoke detector within 10 feet of cooking appliances, within 3 feet of bathroom doors, or in locations subject to direct airflow from HVAC vents, ceiling fans, or windows. These locations cause nuisance alarms that lead homeowners to disable or remove detectors. The detector instructions include specific placement guidance for each installation location type.

State Laws Requiring 10-Year Sealed Battery Smoke Alarms

Many US states have enacted laws requiring 10-year sealed battery smoke alarms in new and replacement installations. These laws specifically prohibit the sale or installation of 9V battery smoke alarms with user-replaceable batteries in new home construction and during replacement of existing alarms. The First Alert photoelectric smoke detector with its sealed 10-year lithium battery is specifically designed to comply with these laws.

States that have enacted 10-year sealed battery requirements include California, Iowa, Maryland, Massachusetts, New York, Oregon, Vermont, and others. The specific scope of each law varies (some apply only to new construction, others apply to all replacements, some include additional sounder or wireless interconnection requirements), but the common requirement across all of them is that the battery must be sealed and non-removable with a 10-year service life. The First Alert photoelectric smoke detector satisfies this core requirement.

Homeowners in states without specific 10-year sealed battery laws still benefit from the upgrade because it eliminates the dead-battery failure mode that causes most smoke alarm failures during actual fires. Insurance carriers increasingly require or recommend sealed 10-year smoke alarms for homeowner policies, and the alarm purchase is often deductible against the policy or qualifies for premium discounts. Check with your specific insurance carrier for available credits.

Important: This Is a Smoke Detector, Not a CO Detector

The First Alert photoelectric smoke detector is specifically a smoke alarm, not a carbon monoxide (CO) alarm. The photoelectric sensor detects smoke particles only. Carbon monoxide is an invisible, odorless gas produced by incomplete combustion (gas appliances, fireplaces, automobile exhaust, gas-powered generators) that has its own dangerous health effects entirely separate from fire smoke. CO detection requires a different sensor type and a separate alarm.

Every US home should have BOTH smoke detection and CO detection for complete safety. Smoke detectors like the First Alert photoelectric smoke detector handle fire risk. Separate CO detectors handle carbon monoxide poisoning risk. Some combination units integrate both sensors into a single device, but they are functionally two separate alarms in one housing. The First Alert photoelectric smoke detector is the smoke-only configuration, which is appropriate for homes that already have separate CO detection or for room locations where smoke detection alone is the focus.

If your home uses any gas appliances (gas furnace, gas water heater, gas range, gas fireplace, gas dryer), uses a wood-burning fireplace or wood stove, has an attached garage, or operates a gas-powered standby generator, you have CO risk and need dedicated CO detection in addition to smoke detection. Browse the broader IB Lighting safety and electrical product collection for related home safety products, or contact our team for guidance on building a complete fire-and-CO detection system for your home.

First Alert Photoelectric Smoke Detector Specifications

First Alert Photoelectric Smoke Detector FAQs

Who the First Alert Photoelectric Smoke Detector Is Built For

The First Alert photoelectric smoke detector serves three clear buyer types. The first is homeowners doing scheduled smoke alarm replacement as part of normal home safety maintenance. Most smoke alarms reach end-of-service-life at the 10-year mark, and replacement is the right time to upgrade from older 9V battery alarms to sealed 10-year lithium units. For these buyers, the 2-pack format covers two locations per purchase, and most single-family homes need 2 to 3 of these 2-packs for complete whole-house replacement.

The second buyer is the landlord or property manager replacing smoke alarms across rental units. Many states and municipalities now require sealed 10-year battery smoke alarms in rental properties, with the property owner responsible for installation and maintenance. The First Alert photoelectric smoke detector specifically satisfies these requirements with sealed batteries that tenants cannot remove or disable. For multi-unit property managers ordering large quantities, contact IB Lighting for case-quantity volume pricing.

The third buyer is the homeowner responding to an insurance carrier requirement or recommendation. Insurance carriers increasingly require 10-year sealed battery smoke alarms as a condition of policy renewal or as a premium discount qualifier. The First Alert photoelectric smoke detector satisfies these requirements while also delivering meaningfully better fire safety than older 9V battery alarms it replaces. Browse the broader IB Lighting electrical and safety product collection for related products, or pair with a Generac standby generator if your home safety upgrade also includes outage protection.

Photoelectric vs Ionization Smoke Detectors: Which Should You Buy?

The two main smoke detector sensor types serve different fire profiles. The First Alert photoelectric smoke detector uses photoelectric sensing, which is the type most fire safety experts recommend for residential installations, particularly in sleeping areas. Understanding the difference helps you make the right choice for your specific installation.

Choose photoelectric like the First Alert photoelectric smoke detector if you want maximum protection against the slow smoldering fires that cause the majority of residential fire deaths. Photoelectric sensors detect smoldering mattress fires, smoldering upholstered furniture fires, smoldering electrical wiring fires, and similar slow-burning fires earlier than ionization sensors do. Photoelectric alarms also produce fewer nuisance alarms from cooking and shower steam, which means homeowners are less likely to disable them.

Choose ionization alarms (a different product type, not this one) for backup protection against fast-flaming fires like paper or cooking flame-ups. Ionization alarms detect smaller smoke particles produced by fast-burning materials. The National Fire Protection Association ideally recommends both types for complete protection, but if you can only have one, photoelectric is the type most experts recommend installing in bedrooms and sleeping areas. The First Alert photoelectric smoke detector is the right choice for primary residential coverage.

Installation Tips for the First Alert Photoelectric Smoke Detector

Installing the First Alert photoelectric smoke detector takes about 5 minutes per unit and requires only basic tools. First, select the installation location following NFPA placement guidelines: inside every bedroom, in hallways outside sleeping areas, on every level of the home. Avoid locations within 10 feet of cooking appliances, within 3 feet of bathroom doors, or directly in line with HVAC vents and ceiling fans where airflow can cause nuisance alarms.

For ceiling installation (the recommended location for most rooms), mount the unit in the center of the room when possible, or at least 4 inches from the nearest wall and at least 4 inches from any adjacent fixture or vent. The detector should ideally be mounted flush to the ceiling, not on a wall. Wall mounting is acceptable in some installations but only if the unit is mounted between 4 and 12 inches below the ceiling. The included mounting bracket attaches to the ceiling first, then the detector twists onto the bracket.

After mounting, press the test button to verify the alarm operates correctly. The alarm will emit its full audible signal during the test, so warn family members before testing. Write the installation date on the back of the unit with a permanent marker before mounting, which helps track the 10-year replacement schedule. Add a calendar reminder for 10 years from install date as a backup tracking method. Test the alarm monthly thereafter using the test button.

Maintenance and Testing

The First Alert photoelectric smoke detector requires minimal maintenance over its 10-year service life because the sealed battery eliminates the most common maintenance task on traditional smoke alarms (battery replacement). The remaining maintenance items are simple and quick.

Monthly test: Press and hold the test button until the alarm sounds, confirming the detector is operating correctly. This should be done monthly throughout the unit’s service life.

Periodic cleaning: Vacuum the exterior of the detector every 6 months to remove dust accumulation from the vent slots. Dust accumulation can degrade sensor sensitivity over time. A soft brush attachment on a household vacuum cleans the vents adequately without damaging the unit.

Response to low-battery or end-of-life chirp: If the detector produces an intermittent chirp signal (typically every 30 to 60 seconds), this indicates either a low battery condition (in unsealed units, but rare in sealed units) or end-of-life. For the First Alert photoelectric smoke detector with its sealed battery, an intermittent chirp typically means end-of-life and the unit should be replaced.

10-year replacement: At the 10-year service life mark, replace the entire unit. The sealed battery and the photoelectric sensor both reach end-of-service-life at approximately the same time, so replacement refreshes the entire safety system. Write the new install date on the back of the new unit before mounting.

Browse the complete IB Lighting electrical and safety product collection, pair with a Generac standby generator if your home safety upgrade includes outage protection, or visit our customer FAQ hub for buying guidance. Manufacturer technical sheets are available at the official First Alert website.