Photoelectric sensing alarms may detect visible fire particles (associated with slow smoldering fires) sooner than ionization alarms. At the end of alarm life, the unit will chirp, indicating the alarm is in need of replacement.
No costly sensor replacement needed. Test/Retest Button - Tests unit and silences alarms. At 400 ppm, unit must alarm within 4-15 minutes. Make Sure Your Entire Home is Safe: Kidde, the world's leading manufactured of home safety products, offers a complete product line to protect your home and family.