10 Best Co Smoke Detector Combo 2026 in the United States

The First Alert SMICO100-AC is a 6-pack of combination smoke and carbon monoxide alarms designed for home safety. It uses ionization sensors, which are effective at quickly detecting fast-flaming fires but can be more prone to occasional false alarms from cooking smoke. This model benefits from First Alert's Precision Detection technology, which helps reduce those nuisance alarms, making it more reliable in kitchens or near cooking areas. The alarms are hardwired with a battery backup, ensuring they stay powered even during outages, which is essential for continuous protection.

Another helpful feature is its ability to interconnect with most First Alert and BRK alarms; when one alarm detects a problem, all connected alarms sound together for quicker alerts throughout the home. The latching alarm indicator visually shows which unit triggered the alert or has a low battery, making it easier to identify the source. Installation is simplified by a mounting bracket that allows some rotation for proper alignment. The alarms come with included 9V batteries and promise long-term safety, supported by a brand with a strong reputation in home security.

One limitation is that ionization sensors may not detect smoldering fires as quickly as photoelectric types, so those seeking broader fire detection might consider photoelectric or dual-sensor alarms. Additionally, while the alarms interconnect, this functionality only works fully within the same brand ecosystem. For users wanting smart features or a digital display, this model lacks those, maintaining a straightforward design without advanced connectivity like smartphone alerts. This 6-pack is well suited for homeowners looking to protect multiple rooms affordably with reliable, easy-to-install hardwired detectors that cover both smoke and carbon monoxide risks.

The Kidde Smoke & Carbon Monoxide Detector is a combination device that offers dual protection by detecting both smoke and carbon monoxide. It features a 10-year battery, eliminating the need for frequent battery changes and preventing those annoying low battery chirps. This detector uses enhanced sensing technology to reduce false alarms caused by everyday activities like cooking, and it's compliant with the latest industry standards for safety and performance.

The device is equipped with LED lights that provide clear indications of its status: green for normal operation, amber for errors, and red when smoke or CO is detected, accompanied by a loud 85-decibel alarm to alert you to danger. Installation is straightforward since no wiring is required; you simply mount the bracket and attach the detector. The test and hush button allows easy alarm testing and silencing of false alarms.

The 10-year limited warranty applies to the alarm, not necessarily the battery performance. This product is a good choice for those looking for a reliable, easy-to-install smoke and carbon monoxide detector with a long-lasting battery, although it may not be ideal for those who prefer interconnected alarms for broader home safety coverage.

The First Alert SMCO100 is a battery-operated combination smoke and carbon monoxide alarm that comes in a convenient three-pack, making it a good choice for whole-home coverage. It uses photoelectric sensors, which are effective at detecting slow, smoldering fires and are less likely to cause false alarms from cooking fumes—a common nuisance in kitchen areas. The inclusion of carbon monoxide detection adds an important layer of safety against this invisible, odorless gas.

Being battery-powered, the alarms are easy to install anywhere without wiring, though you will need to replace the AA batteries periodically. The device features a test/silence button for quick checks or to quiet nuisance alarms. It also has an end-of-life warning, alerting you when it’s time to replace the unit, which helps maintain long-term safety. While it doesn’t have advanced smart features like app connectivity or voice alerts, it covers the essentials well with clear audible warnings for both smoke and CO.

With strong compliance to updated detection standards, this model is a reliable option for users wanting straightforward, dependable protection without dealing with complex setup or smart home integration. The battery operation means users need to stay on top of battery changes to avoid losing protection. If you prefer interconnected alarms that communicate wirelessly across rooms, this model does not offer that feature. This First Alert model fits well for those looking for easy installation, reliable dual hazard detection, and simple maintenance in a trusted brand.