First Alert Combination Smoke and Carbon Monoxide Detector - Dual

In this review the First Alert SCO5CN Combination Smoke and Carbon Monoxide Alarm is examined for everyday home safety use; the bottom line is that it is a straightforward, battery operated dual sensor alarm well suited to bedrooms and living areas where simple installation and clear alerts are priorities. The reviewer found the unit's combination of a photoelectric smoke sensor and an electrochemical CO sensor to be the single biggest reason to buy, as it reduces the need for separate devices while providing distinct alarm tones and lights to identify threats.

Key Features

• Dual detection: A photoelectric smoke sensor and an electrochemical CO sensor are combined to detect both smoldering fires and carbon monoxide leaks from a single device.
• Photoelectric smoke sensing: The smoke sensor is designed to detect the kind of smoke produced by smoldering fires while helping minimize false alarms from cooking or shower steam.
• Electrochemical CO sensing: The CO sensor detects carbon monoxide leaks from fuel burning appliances, blocked chimneys, and nearby generators for broader home protection.
• Loud audible alarm: An 85 decibel siren alerts occupants promptly to danger so you can respond quickly to smoke or CO events.
• Battery operation: Being battery operated means no electrician is required for installation and the unit can be placed where hardwiring is impractical.

Who It's For

This alarm is best for homeowners, renters, and landlords who want a single, compact device to protect sleeping areas and common rooms from both smoke and carbon monoxide without wiring. The easy installation and clear indicator lights make it suitable for those who prefer a low-maintenance safety solution.

It may be less suitable for those who require long, maintenance-free operation since customer reports indicate batteries often need replacement every few months; buyers wanting hardwired, interconnected systems or minimal battery changes should consider other models.

Pros & Cons

Pros

• Easy to install in bedrooms and hallways without professional help.
• High-quality construction and clear indicator lights that distinguish smoke from CO events.
• Good value for combining two detectors into one compact unit.
• Bright alarm and unique sounds make it easy to tell which threat is present.

Cons

• Some customers report intermittent false alarms or unexpected beeping, which can be disruptive.
• Battery life is mixed, with typical replacement intervals reported around four to six months.

Specifications

Brand	First Alert
Model	SCO5CN Combination Alarm
Detection types	Photoelectric smoke and electrochemical carbon monoxide
Power	Battery operated
Alarm volume	85 decibel siren
Included items	Battery included

Our Verdict

The First Alert SCO5CN is a practical, cost-effective dual sensor alarm that fits most households needing both smoke and CO protection without wiring. It is recommended for rooms where easy installation and clear, distinct alerts are priorities, though buyers should expect to monitor and replace batteries periodically.

Frequently Asked Questions

Is this unit hardwired?
No, the SCO5CN is battery operated so it does not require hardwiring or an electrician for installation.

Will it detect both smoldering fires and CO leaks?
Yes, it uses a photoelectric sensor for smoldering smoke and an electrochemical sensor for carbon monoxide detection.

How loud is the alarm?
The unit emits an 85 decibel siren and uses unique sounds and indicator lights to distinguish smoke from CO alerts.