Customer Reviews For The Hardwire Combo Smoke and Carbon Monoxide Alarm with 10-Year Battery Backup

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How does this hardwired combination smoke and carbon monoxide alarm work?

This hardwired combination smoke and carbon monoxide alarm runs on standard 120V AC household power and features dual-sensor technology to sense both fire and toxic carbon monoxide (CO) gas in a single unit. The USI/SMCO-HW10YR-P utilizes Sensing Plus multi-criteria detection to identify fast-flaming fires, slow-smoldering fires, and dangerous CO leaks, while an integrated 10-year battery backup ensures uninterrupted protection during power outages.

Can the USI/SMCO-HW10YR-P hardwired combination alarm be interconnected with other detectors?

Yes. This hardwired combination smoke and carbon monoxide detector supports multi-station interconnectivity with up to 24 compatible USI devices (including up to 18 smoke alarms). When connected via your home's 120V electrical wiring, if one unit detects smoke or carbon monoxide, all interconnected hardwired combination alarms sound simultaneously throughout the entire house to alert occupants quickly.

Does this hardwired smoke and CO detector reduce false alarms from cooking?

Yes. Engineered to meet modern UL 217 (9th Edition) and UL 2034 safety standards, the unit's multi-criteria smart sensors are specifically calibrated to distinguish between real fire threats and routine nuisance triggers like steam, humidity, or everyday cooking smoke, drastically reducing false alarms in kitchen and hallway areas.

How do I replace an old hardwired detector with the USI/SMCO-HW10YR-P combination unit?

Turn off electricity at your main circuit breaker, remove the old mounting bracket, and connect the included quick-connect wiring harness (line, neutral, and interconnect wire) to your electrical junction box. Twist the new hardwired combination smoke and carbon monoxide alarm onto its base. The sealed 10-year battery backup will activate automatically upon installation.

The Universal Security Instruments Hardwire Smoke, Fire, and Carbon Monoxide Alarm with 10-Year Battery Backup provides comprehensive 3-in-1 hazard protection for your home. Powered by standard 120V AC household electrical wiring, this high-performance hardwired combination smoke and carbon monoxide detector includes a sealed lithium 10 year battery backup to ensure continuous monitoring during power outages. Advanced Sensing Plus Multi-Criteria Detection allows this 10 year smoke detector to rapidly identify both fast-flaming fires and slow, smoldering fires, while reducing false alarms from cooking smoke or steam.

An integrated electrochemical sensor detects invisible carbon monoxide gas, protecting your home against fire and CO from a single device. Built for whole-home safety, this hardwired combination alarm interconnects with compatible units so every detector sounds the instant danger is detected. Clear, spoken voice alerts state the exact hazard, distinguishing between smoke, carbon monoxide, and maintenance warnings. Upgrading to this maintenance-free 10-year smoke and CO detector ensures code compliance with zero battery changes for a full decade.

Key Features & Benefits

Hardwired with 10-Year Battery Backup: Powered by 120V household electricity with a sealed 10-year lithium battery backup during power outages.
Dual Smoke & CO Protection: Combines multi-criteria photoelectric fire sensing with an electrochemical carbon monoxide sensor in one compact unit.
Interconnectable System: Wire-interconnectable with up to 24 compatible USI alarms, ensuring all alarms sound simultaneously when a hazard is detected.
Smart Nuisance Control: Advanced Sensing Plus® technology prevents false alarms triggered by everyday cooking steam or humidity.
Quick-Connect Harness: Includes a pre-stripped wiring harness and mounting bracket for fast, effortless electrical installation.
Test / Silence Button: Allows for quick single-button diagnostic testing and easy silencing of non-emergency alerts.

Industry Standards & Compliance

This alarm is certified to meet strict residential building requirements:

ETL Listed: Safety tested to UL 217 (9th Edition) standards for smoke alarms and UL 2034 (4th Edition) standards for carbon monoxide safety.
NFPA Compliant: Meets NFPA 72 and NFPA 720 standards for hardwired residential fire and carbon monoxide safety systems.
Federal Housing Standards: Fully compliant with FHA, HUD, and CSFM (California State Fire Marshal) safety requirements.
New Construction Approved: Ideal for new construction, full home renovations, and replacing existing hardwired units in bedrooms, hallways, and living areas.

(Note: This alarm plugs directly into your home's 120V electrical wiring. If you're replacing an existing hardwired alarm, installation is simple. For brand-new wiring locations, we recommend hiring a licensed electrician.)