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 Kidde Hardwired Smoke & Carbon Monoxide Detector combo is a solid choice for anyone wanting dependable protection against both fire and carbon monoxide hazards with one device. It uses photoelectric and electrochemical sensors, which are effective for detecting smoke and CO quickly and reliably. The hardwired power source with a 10-year battery backup means you won’t have to worry about frequent battery changes, adding convenience and peace of mind. Voice alerts clearly announce whether the alarm is for smoke or carbon monoxide, which can help avoid confusion in an emergency. The 85-decibel alarm sound combined with LED light notifications makes it easy to notice the alert even from a distance or in noisy environments. This 3-pack is great for covering multiple rooms or floors in a home.

The detectors interconnect, so when one alarm sounds, all connected alarms will sound, enhancing safety throughout your home. While it lacks advanced smart features like smartphone alerts or app integration, it covers the basics very well and is straightforward to install with the included mounting base and wiring harness. The device is rated to operate in humid conditions and up to moderate temperatures, suitable for most indoor environments.

With a strong customer rating and a 10-year lifespan, it offers a long-term safety solution. For those seeking a simple, effective, and durable combo alarm without extra smart tech features, this Kidde model fits the bill nicely.