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 Smoke and Carbon Monoxide Detector Combo offers reliable dual protection using photoelectric sensors, which are effective at detecting smoke from smoldering fires. It runs on a built-in 10-year lithium battery, so you won’t need to replace batteries often, reducing hassle and ensuring long-term safety. A useful feature is its wireless interconnection via RF signals—when one alarm senses danger, all linked alarms sound off, providing full-home coverage and quick alerts. However, it doesn’t support Wi-Fi, so you won’t get smartphone notifications or smart home integration.

The alarms emit a loud audible sound to alert you, typical of safety devices. Made from durable, heat-resistant plastic, they are designed to last and withstand everyday conditions. Installation is straightforward with included screws and anchors, but keep in mind the detectors are somewhat bulky at nearly 6 inches wide. Each unit covers about 215-430 square feet, so a 6-pack is ideal for medium to larger homes.

The product comes with a 5-year warranty and responsive support, which adds peace of mind. Some users may find the lack of Wi-Fi limiting if they prefer app alerts, but if you want dependable, low-maintenance alarms that work well together across multiple rooms, this set 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.