520 Hz Low Frequency for 120VAC Smoke Alarms IFC 2021

520 Hz Low Frequency for 120VAC Smoke Alarms IFC 2021

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Firex 50004 120V AC Direct Wire with Battery Back-up Smoke Alarm with Moisture Resistant Coating (Upgraded to i5000-KA-F Kit)

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520 Hz Low Frequency for 120VAC Smoke Alarms IFC 2021

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Smoke alarms for hard of hearing, hearing loss, notch loss --- Loudenlow - 520 Hertz Smoke Alarm for hard of hearing people (HOH) with high frequency hearing loss. (Hear it online with