Kidde has been making residential safety devices for decades. Their hardwired CO detector with battery backup is a straightforward solution for a serious problem. It connects directly to your home’s 120-volt wiring and includes a 9-volt alkaline battery in the back. That means it keeps working even when the power goes out—which is exactly when carbon monoxide risks can spike from generators or faulty furnaces.

The unit uses an electrochemical sensor, which is the gold standard for accurate CO detection. When it picks up dangerous levels, an 85-decibel alarm sounds and a red LED flashes. A green LED indicates normal operation, so you know at a glance it’s powered and ready. There’s no Wi-Fi, no app, no voice assistant integration. It’s a dedicated, tamper-resistant alarm that does one thing and does it reliably.

For a hardwired detector, installation is straightforward if you have existing wiring. The battery backup is easy to access for annual replacements. One honest note: the alarm is loud at 85 decibels, which is good for waking you up but sharp enough to be uncomfortable during testing. That’s the point. It’s not a smart device, but for basic, code-compliant protection, it’s a solid choice.