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Kidde 10 Year Worry-Free Battery Powered Smoke Detector with Ionization Sensor$14.99
No hardwire installation required and no need to change the batteries over the 10-year life of the alarm. Simply replace the entire unit after 10 years. UL/CSFM Ref.
Kidde Part i9010. Smoke detector utilizes an ionization sensor to detect fire hazards and sounds an 85 db alarm when a hazard is detected.