10 Best Smoke Alarms 2025 in the United States

The X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector is a versatile safety device ideal for homeowners seeking comprehensive protection. It features dual sensors—photoelectric for smoke and electrochemical for CO—which ensure reliable detection of both hazards. The interconnected capability allows up to 24 units to function together, so if one alarm triggers, all will sound, offering enhanced safety across larger homes.

One of the standout features is the built-in 10-year lithium battery, eliminating the hassle of frequent replacements. This aspect, combined with the 820 ft wireless transmission range, makes it suitable for well-spread properties. However, this model does not include Wi-Fi connectivity, which limits remote monitoring capabilities, although an alternative model with Wi-Fi is available for those needing that functionality.

The product includes an informative LCD display that shows real-time CO levels, battery status, and working condition, adding a layer of user-friendly interaction. The alarms are housed in heat-resistant PC plastic, ensuring durability, and come in a 6-pack, which is practical for comprehensive coverage. Installation is straightforward via a screw-in method. It meets necessary certifications and standards, providing peace of mind regarding its safety reliability.

This smoke and CO detector suits those looking for a long-lasting, networked system without the need for internet connectivity. It's backed by a 5-year warranty and lifetime technical support, ensuring lasting service and support from the manufacturer.

The First Alert SMI100 smoke alarm is a solid choice for those looking for an effective and user-friendly smoke detection solution. One of its key strengths lies in its Precision Detection advanced sensing technology, designed to minimize false alarms from cooking while still providing timely alerts in case of a fire. This feature makes it particularly suitable for households that often deal with nuisance alarms from smoke generated during cooking activities. Additionally, being battery-operated allows for easy installation without the need for complex wiring, making it accessible even for those who may not be very handy.

The front access battery compartment is another convenience, allowing for quick battery changes when needed. An end-of-life warning feature is also included, so users know exactly when it’s time to replace the unit, which is essential for maintaining safety standards. The test/silence button ensures that users can regularly check the alarm’s functionality, adding an extra layer of peace of mind.

On the downside, the SMI100 relies on battery power, which means you need to keep an eye on battery levels to ensure it doesn't go silent during an emergency due to depleted batteries. Some may prefer a hardwired option, especially in larger homes where multiple units are beneficial. The ionization sensor type is effective for detecting flaming fires but may not be as responsive to smoldering fires compared to photoelectric sensors. Therefore, for those who prioritize comprehensive smoke detection, seeking a combination of both sensor types might be advisable.

The Kidde Hardwired Smoke & Carbon Monoxide Detector is a solid choice for protecting your home from both smoke and carbon monoxide hazards using one combined device. It uses photoelectric sensors for smoke detection and electrochemical sensors for carbon monoxide, which are known for reliable and timely alerts. The alarm connects directly to your home’s electrical system, ensuring constant power, and includes a 10-year lithium-ion battery backup so it continues working even during power outages, without needing battery changes for a decade. This saves you both hassle and money in the long run.

A standout feature is its ability to interconnect multiple alarms, so when one detects danger, all alarms sound, giving you more time to respond regardless of where you are in the house. The clear voice alerts specify if there's smoke or carbon monoxide, which helps avoid confusion during an emergency. It also includes LED indicators for easy status checks and a self-testing function to help ensure it’s always ready to work, although regular manual testing is still recommended.

This detector meets the latest UL safety standards, which means it has been thoroughly tested for performance and reliability. It also reduces false alarms from common sources like cooking, making it less annoying in daily use. The included 4-pack and mounting hardware make it convenient for multiple rooms. While installation may require professional help due to the hardwired design and it lacks advanced smart home features like app connectivity or remote alerts, this Kidde alarm is a practical and effective option for those prioritizing dependable, straightforward smoke and carbon monoxide protection with long battery life and interconnectivity.