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The FIRST ALERT battery operated ionization smoke alarm provides the ideal defense for detecting fast flaming fires. A natural addition in the home or place of business, this alarm utilizes ionization technology that recognizes and detects smoke as soon as it enters the unit's chamber. The model comes equipped with a single test button that allows you to check the functionality of your device. The addition of a slide out battery drawer allows for quick and easy battery replacement. The FIRST ALERT SA300CN3 battery operated ionization smoke alarm features a 10 years limited warranty.