Ionization sensor technology senses invisible fire particles in the Kidde smoke detector; Photoelectric sensor detects visible fire particles in the Kidde smoke & carbon monoxide detector.
10-year lithium battery in the Kidde smoke detector never needs replacing; Battery operated Kidde detector provides protection even during power outages.
Green, amber & red LEDs indicate normal operation, errors & smoke/fire/CO events detected in the Kidde combo alarm.
85 decibel alarms sound when smoke, fire or carbon monoxide is detected by the Kidde detectors.
Test-Hush button on both Kidde detectors for easy alarm testing & silencing of nuisance alarms from cooking or shower steam.