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

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 SMCO100 is a battery-operated combo alarm that protects against both smoke and carbon monoxide, making it a practical choice for home safety. It uses photoelectric sensors, which are especially good at detecting smoldering fires and reducing false alarms from cooking. This means fewer annoying nuisance alarms compared to traditional models.

Since it runs on 2 included AA batteries, installation is simple and you don’t have to worry about wiring, though you will need to replace batteries periodically. The alarm includes a test/silence button for easy checks and temporarily silencing false alerts. It also has an end-of-life warning that notifies you when it’s time to replace the unit, helping to ensure ongoing protection. The 3-pack offers good value for covering multiple rooms or floors. However, since these smoke/CO detectors are not interconnected, alarms won’t sound simultaneously throughout the house if one detects danger, which could be a drawback for larger homes.

This First Alert model provides a reliable, user-friendly option for those seeking straightforward, battery-powered smoke and carbon monoxide detection without extra complexity.

The X-Sense Combination Smoke and Carbon Monoxide Detector, model XP0A-MR31, is a dual-purpose alarm designed to provide comprehensive safety for your home. Featuring both electrochemical and photoelectric sensors, it can detect both smoke and carbon monoxide. One of its standout features is the talking alarm, which announces the location and type of danger, making it easier to respond quickly. Additionally, the device connects to an app, allowing you to receive instant alerts on your phone and share them with up to 12 family members.

The interconnected system ensures that if one alarm goes off, all alarms in the house will also sound, enhancing safety in a multi-room setup. The device has a sleek, ultra-slim design and is easy to install with clear spoken instructions. It also offers an optional Protect+ Premium subscription for professional monitoring, which can dispatch emergency services within seconds if required. With a long lifespan of 10 years and replaceable CR123A batteries that last up to 5 years, the maintenance effort is minimal.

However, one potential drawback is that it is battery-powered, which means you will need to keep an eye on battery life and replace them when needed. Also, professional monitoring requires an additional subscription, which might not be ideal for everyone. This product is well-suited for families looking for a reliable and easy-to-use smoke and carbon monoxide detector with advanced features like voice location and app alerts.