Amazon has the Kidde Smoke Detector for $19.12, which is 60% off its original price of $47.99.

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The Kidde Smoke Detector uses photoelectric sensor technology to sense visible fire particles associated with smoldering fires. It operates on a 10-year lithium battery, ensuring reliable detection during a power failure.

• Photoelectric sensor technology senses smoldering fires.
• Operates on a 10-year lithium battery, eliminating the need for battery replacement.
• Test-Hush button allows easy testing and silencing of false alarms.