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1 USI Hallway 3-in-1 Smoke, Fire and Carbon Monoxide Smart Alarm with 10 Year Tamper-Proof Sealed Battery (MICH3510S) 3-in-1 Smart Alarm provides 10 years of continuous protection against fast flaming fires, slow smoldering fires and carbon monoxide Sealed battery (included) will never have to be replaced throughout the life of the alarm Features microprocessor intelligence to virtually eliminate nuisance alarms Quick activation battery pull tab makes the alarm easy to install while the deactivation key makes the batteries safe for disposal Smart Alarm Technology virtually eliminates nuisance alarms Deactivation key switches alarm off and makes alarm safe for disposal Conforms to UL217 and UL2034 standards California State Fire Marshal Approved 10 Year Limited Warranty 1 USI Kitchen 2-in-1 Smoke & Fire Smart Alarm with 10 year Sealed Battery & Universal Smoke Sensing Technology (MDSK300S) Tamper proof design provides a higher level of security to prevent battery removal Gives a decade of peace of mind Provides the benefits of both photoelectric and ionization technology in one alarm Maintenance Free Battery Power Never replace batteries for 10 years, saving up to $38.00 over the life of the alarm Eliminates annoying low battery chirps 10 year sealed batteries provide continuous protection, even in the event of a power outage Smart Alarm Technology virtually eliminates nuisance alarms Combines the benefits of photoelectric & ionization technology in one alarm

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Even the same device shows different effects depending on the input parameters

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