Ensuring the safety of your home and loved ones is paramount. Smoke and carbon monoxide alarms are essential devices that provide early warnings of dangerous conditions, giving you crucial time to react. Choosing the right combination alarm can offer comprehensive protection against two of the most significant household threats.
- First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
- Provides reliable 2-in-1 protection against both smoke and carbon monoxide
- End-of-life warning lets you know when it’s time to replace the alarm
- Battery-operated alarm allows for easy installation and maintenance
- 2-in-1 DETECTION: Model 30CUDR detects both smoke and carbon monoxide and features advanced sensing technology with over 25% faster smoke detection*; sounds a loud 85-decibel alarm with red LED light for clear visual warnings; suitable for homes
- AA BATTERY OPERATION & WARRANTY: Powered by two AA batteries (included) for easy, no-wiring setup . Backed by 10-year limited warranty** that starts from date of purchase
- REDUCED FALSE ALARMS: Uses advanced sensing technology that helps distinguish between real smoke and everyday cooking or steam; helps reduce false alarms while maintaining quick, accurate detection when smoke is present
- TESTED FOR RELIABILITY & COMPLIANCE: Rigorously tested to meet UL 217 10th Edition, UL 2034 5th Edition, and FCC standards for performance and safety; enhanced sensing technology helps reduce false alarms from everyday cooking or steam
- Please Note: The SC07 is a basic standalone unit. It does not support wireless interconnection, Wi-Fi, or base station connection; for wireless interconnection, search for SC07-W
- 10-Year Protection, Zero Maintenance: A built-in sealed lithium battery powers the alarm for a full decade—no battery replacements, no late-night low-battery chirps, and no ladder climbing
- Photoelectric Smoke Sensor and Electrochemical CO Sensor: Responds faster to slow-smoldering fires, helps reduce cooking-related false alarms, and reliably detects dangerous carbon monoxide
- Simple Installation: No rewiring required; easily mount this smoke and carbon monoxide alarm on a wall or ceiling using the included mounting bracket, screws, and anchor plugs
- Please Note: The SC07 is a basic standalone unit. It does not support wireless interconnection, Wi-Fi, or base station connection; for wireless interconnection, search for SC07-W
- 10-Year Protection, Zero Maintenance: A built-in sealed lithium battery powers the alarm for a full decade—no battery replacements, no late-night low-battery chirps, and no ladder climbing
- Photoelectric Smoke Sensor and Electrochemical CO Sensor: Responds faster to slow-smoldering fires, helps reduce cooking-related false alarms, and reliably detects dangerous carbon monoxide
- Simple Installation: No rewiring required; easily mount this smoke and carbon monoxide alarm on a wall or ceiling using the included mounting bracket, screws, and anchor plugs
- 2-in-1 Protection: The smoke and carbon monoxide detector is equipped with both photoelectric smoke sensor and electrochemical CO sensor that both detect smoke and dangerous CO levels
- ETL Listed: The smoke and carbon monoxide alarm meets the UL 217 & UL 2034 safety standards for your peace of mind and absolute confidence in our product
- Simple Installation: Requires no rewiring; easy to mount this fire and CO alarm on any wall or ceiling with the included mounting bracket, screws and anchor plugs
- Combination Alarm with CO Readings: the large LCD display clearly indicates real-time carbon monoxide (CO) levels in the surrounding air, as well as its battery level and working status
- 2-in-1 Protection: The smoke and carbon monoxide detector is equipped with both photoelectric smoke sensor and electrochemical CO sensor that both detect smoke and dangerous CO levels
- ETL Listed: The smoke and carbon monoxide alarm meets the UL 217 & UL 2034 safety standards for your peace of mind and absolute confidence in our product
- Simple Installation: Requires no rewiring; easy to mount this fire and CO alarm on any wall or ceiling with the included mounting bracket, screws and anchor plugs
- Combination Alarm with CO Readings: the large LCD display clearly indicates real-time carbon monoxide (CO) levels in the surrounding air, as well as its battery level and working status
- 2-in-1 Protection: The smoke and carbon monoxide detector is equipped with both photoelectric smoke sensor and electrochemical CO sensor that both detect smoke and dangerous CO levels
- ETL Listed: The smoke and carbon monoxide alarm meets the UL 217 & UL 2034 safety standards for your peace of mind and absolute confidence in our product
- Simple Installation: Requires no rewiring; easy to mount this fire and CO alarm on any wall or ceiling with the included mounting bracket, screws and anchor plugs
- Combination Alarm with CO Readings: the large LCD display clearly indicates real-time carbon monoxide (CO) levels in the surrounding air, as well as its battery level and working status
- 2-in-1 Protection: The smoke and carbon monoxide detector is equipped with both photoelectric smoke sensor and electrochemical CO sensor that both detect smoke and dangerous CO levels
- ETL Listed: The smoke and carbon monoxide alarm meets the UL 217 & UL 2034 safety standards for your peace of mind and absolute confidence in our product
- Simple Installation: Requires no rewiring; easy to mount this fire and CO alarm on any wall or ceiling with the included mounting bracket, screws and anchor plugs
- Combination Alarm with CO Readings: the large LCD display clearly indicates real-time carbon monoxide (CO) levels in the surrounding air, as well as its battery level and working status
- BRK's Precision Detection advanced sensing technology reduces cooking nuisance alarms and delivers early warning
- Interconnects with most First Alert and BRK alarms so when one sounds, all compatible alarms sound to provide an early warning
- Battery backup provides continuous protection during power outages
- Perfect mount bracket keeps the alarm secure over a wide rotation range for ideal alignment and easy installation
This article is part of our complete guide Safety & Security — browse all our comparisons and buying guides.
Last update on 2026-10-15 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Smoke & Carbon Monoxide Alarms
Types of Alarms
When selecting a smoke and carbon monoxide alarm, you'll encounter a few main types. Combination alarms detect both smoke and carbon monoxide in a single unit, offering convenience and space-saving. Interconnected alarms communicate with each other wirelessly or via a hardwired system. If one alarm detects a hazard, all connected alarms will sound, providing a more robust warning system throughout the home.
Power Sources
Alarms are typically powered by either a battery backup or a hardwired connection to your home's electrical system. Battery-powered units are easier to install but require regular battery changes. Hardwired alarms offer continuous power and often include a battery backup for power outages, though they require professional installation or electrical knowledge. Some newer models feature sealed, long-life batteries that can last up to 10 years, eliminating the need for frequent replacements.
Sensor Technology
Different sensor technologies are used to detect smoke and carbon monoxide. Photoelectric sensors are generally better at detecting slow-burning, smoldering fires that produce a lot of smoke but little flame. Ionization sensors are more responsive to fast-flaming fires. Many modern combination alarms utilize dual-sensor technology, combining both photoelectric and ionization sensors for broader detection capabilities. For carbon monoxide detection, electrochemical sensors are the standard, accurately measuring CO levels.
Smart Features and Connectivity
Advanced models offer smart features, including Wi-Fi connectivity. These alarms can send alerts to your smartphone or tablet, notifying you of an emergency even when you're away from home. Some also integrate with smart home systems, allowing for automated actions like turning on lights or unlocking doors in the event of an alarm. Voice alerts, which announce the type and location of the danger, can also help pinpoint the source of the threat more quickly.
