10 Best Smoke Detector Carbon Monoxide Detectors Combo 2025 in the United States

The X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector (SC06-W, 6-Pack) offers a robust solution for home safety. Its dual protection with photoelectric smoke and electrochemical CO sensors ensures comprehensive hazard detection. The standout feature is its wireless interconnectivity, allowing all alarms to sound simultaneously if one is triggered, which can significantly enhance safety throughout a home.

It’s important to note that this device doesn’t support Wi-Fi, which limits remote monitoring capabilities. The 10-year sealed battery is a strong point, offering a long-term power solution without the need for frequent battery changes, though it will give a low battery warning towards the end of its lifespan. The inclusion of a test/silence button is a practical touch, making it easy to check functionality or silence alarms if needed.

This model supports full home coverage by linking up to 24 units, ensuring extensive protection. Since it’s battery-powered, there may be concerns about battery disposal, and the lack of Wi-Fi means users can’t receive alerts on their phones. This detector is ideal for users seeking a reliable, interconnected alarm system with long battery life, but it may not suit those looking for smart home integration features.

The X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector offers a comprehensive safety solution for your home. Equipped with both a photoelectric smoke sensor and an electrochemical CO sensor, it ensures reliable detection of both smoke and carbon monoxide. This 6-pack model allows you to interconnect up to 24 devices, ensuring that when one alarm goes off, all of them do, providing extensive coverage and early warnings throughout your home.

One standout feature is the built-in 10-year lithium battery, which means you don't have to worry about replacing batteries for a decade. Additionally, the LCD display is very informative, showing real-time CO levels, battery status, and working status, which helps in maintaining the device easily. However, it's important to note that while these detectors support wireless interconnection, they do not have Wi-Fi capabilities. If you need Wi-Fi, you would want to look for a different model, specifically the SC07-WX. The alarms are battery-powered, which makes installation straightforward without the need for hardwiring.

The detectors are made from heat-resistant PC plastic, making them durable and reliable. If you're looking for a combination smoke and CO detector that ensures extensive coverage, long battery life, and ease of use, the X-Sense SC07-W is a solid choice.

The First Alert SMICO100-AC is a 3-pack combination smoke and carbon monoxide alarm designed to offer dependable home safety with several useful features. It uses ionization sensors, which are particularly sensitive to fast-flaming fires, making it effective for early smoke detection. Powered by corded electricity with a battery backup, it ensures continuous operation even during power outages—a critical plus. One standout feature is its interconnectivity: when one alarm detects danger, all compatible alarms in the system sound, providing thorough home coverage and early alerts throughout the house.

Installation is user-friendly thanks to a quick connect plug that eliminates complex rewiring, and each unit includes a test/silence button for easy maintenance and to reduce false alarms. The device incorporates First Alert's Precision Detection technology that helps reduce nuisance alarms caused by cooking smoke, which can be a common annoyance in kitchens. While the ionization sensor excels at detecting certain types of fires, pairing this with photoelectric sensors is generally recommended for the best smoke coverage; this model focuses on ionization only.

The alarms include 9V alkaline batteries which come included, but these will need periodic replacement like any battery-operated device. As a hardwired system with battery backup, it combines reliability with peace of mind. With strong popularity, this product suits homeowners looking for a straightforward, reliable smoke and CO alarm system that is easy to install and maintain. This combo alarm provides solid protection with convenient features for everyday home safety.