10 Best Carbon Monoxide Meters 2026 in the United States

The First Alert SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm offers dual protection against both smoke and carbon monoxide, making it a versatile safety device for home use. One of its standout features is the Precision Detection advanced sensing technology, which reduces false alarms from cooking and provides reliable early warnings in case of fire emergencies. This could be especially beneficial for families looking for dependable home safety devices. The alarm is battery-operated, which allows for flexible installation without the need for wiring, and maintenance is straightforward with the included AA batteries and an end-of-life warning system.

The test/silence button ensures the alarm is functioning properly, adding convenience for users. It is also noted for its portability due to the compact design of the 3-pack, making it easy to place in multiple areas of a home. The alarm is a solid option for general home safety, particularly for those needing both smoke and carbon monoxide detection.

The First Alert Combination Smoke & Carbon Monoxide Alarm (model SMICO100-AC) is designed to provide reliable, dual protection against both smoke and carbon monoxide, making it a solid choice for home safety. It uses ionization sensors, which are generally very good at quickly detecting smoke from fast-flaming fires, though they may be less sensitive to slow, smoldering fires compared to photoelectric sensors. The product features advanced Precision Detection technology that helps reduce false alarms from cooking, which is a nice convenience.

The alarm is hardwired with a battery backup, so it stays powered during outages, adding peace of mind. Installation is user-friendly thanks to a Quick Connect Plug, avoiding complicated rewiring. The device includes an alarm that interconnects with other compatible units, meaning if one alarm sounds, all linked alarms will too—helpful for larger homes. It features an audible alarm and a test/silence button that makes checking its function straightforward.

At about 9 ounces and compact size, it’s reasonably portable for wall or ceiling mounting but not meant for carrying around. The battery life depends on the included 9V battery, which needs occasional replacement. If you want a dependable, easy-to-install combination alarm to cover both smoke and CO detection with fewer nuisance alarms, this alarm fits well. However, if you require the most sensitive detection for all fire types, you might look for models with additional sensor technologies.

The First Alert Combination Smoke & Carbon Monoxide Alarm (model SMCO100) is designed to provide reliable protection against both smoke and carbon monoxide in one compact device. It uses photoelectric sensors, which are good at detecting smoke from smoldering fires, and it includes carbon monoxide detection, making it a practical choice for household safety. The unit is battery-operated with included alkaline AA batteries, allowing for easy installation anywhere without wiring.

It features a convenient test and silence button so you can check the alarm's function or temporarily quiet false alarms, which helps reduce nuisance alerts especially when cooking. The alarm also has an end-of-life warning to remind you when it’s time to replace the device, supporting long-term safety. This model meets current industry standards for accuracy and timely alerts. Its display type is straightforward without complex screens, focusing on clear audible alarms and indicator lights, which is typical and effective for home safety alarms.

Weighing just over half a pound and measuring about 5.6 inches wide and deep, it’s highly portable and suitable for various rooms. With a solid 10-year limited warranty, this alarm is well suited for anyone seeking an easy-to-use, dependable combined smoke and carbon monoxide detector. It is a strong choice for basic, reliable home safety with hassle-free battery operation, although it doesn’t include detailed digital readouts or connectivity features.