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Home About Us Vibration Watches Alarm Clocks Bed Shakers Caller ID for TV Door Signalers Product Catalog Parts & Accesories User Guides ResourceLinks Dealer Inquiries Disclaimer   Navigation: Start Search: Door Signalers (300mHz) for use in North America Flashing Light lets you know someone is at the door when you cannot hear a knock or a doorbell because of background noise or a hearing loss. Door Signalers (433mHz) for use in most Countries outside of North America Flashing Light lets you know someone is at the door when you cannot hear a knock or a doorbell because of background noise or a hearing loss.

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