Kidde 2-in-1 Smoke & Carbon Monoxide Detector Combo, 10-Year Battery, Replacement Alert — 4-Unit Pack

Two hazards, one smart unit

Meet the Kidde 2-in-1 Smoke & Carbon Monoxide Detector Combo. This compact device combines a photoelectric smoke sensor with an electrochemical CO sensor, delivering warnings for both smoke and CO in a single, easy-to-manage unit.

Powered by a 10-year lithium battery, it provides ongoing protection even during power outages, eliminating the need for battery swaps for years. The unit includes a Replacement Alert that chirps when it is time to service or replace it, helping you stay on track with safety goals without guesswork.

What you will see and hear

• 85-decibel alarm and a flashing LED signal when smoke, fire, or CO is detected.
• Green standby LED flashes every 60 seconds, indicating power and normal operation.
• Automatic activation as soon as the unit is mounted—no tabs, switches, or extra steps.

Where to place and how it is built

• Install on every level and near sleeping areas to help cover critical spaces.
• UL-listed with a 10-year warranty on the alarm (battery performance not included).
• Dust coverage note: keep the dust cover on until construction finishes to reduce nuisance alarms.

Life with a Kidde detector means you have a single, trusted device handling two kinds of danger signals, backed by a brand with a long history of safety devices. The unit chirps at the end of its life, signaling it needs replacement and offering a clear cue for maintenance in your home safety plan.

While no device can guarantee outcomes, this combination detector is designed to be a practical, low-maintenance part of an overall safety strategy, providing early warnings and clear, actionable signals when something is not right.