The Kidde Hardwired Combo Smoke/CO Alarm is a dual-detection safety device that protects against both smoke and carbon monoxide in one unit. This AC/DC powered alarm features photoelectric smoke sensing technology and an electrochemical CO sensor for comprehensive home protection. The unit includes a sealed 10-year lithium battery backup that ensures continuous operation during power outages without requiring battery replacements.

Key features include an intelligent voice messaging system that provides clear verbal alerts alongside the 85dB alarm tone, announcing specific conditions such as "Fire" for smoke detection, "Warning: Carbon Monoxide" for CO detection, "Replace alarm" at end of life, and "Hush mode activated" when silencing nuisance alarms. The flashing LED status ring allows easy identification of the alarm's current state. Advanced sensing technology reduces false alarms often caused by cooking or steam.

The alarm can be interconnected with up to 24 compatible Kidde devices to create a whole-home alert system, ensuring that when one alarm detects danger, all connected alarms sound simultaneously. The convenient Hush feature allows temporary silencing of nuisance alarms for 8-10 minutes. Installation is straightforward with standard AC hardwired connections, and the unit operates continuously for 10 years before requiring replacement.