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Audioon-door speakerphones

To establish the person come, without opening a door and by that not to give the chance to the undesirable visitor to get into the house, audioon-door speakerphones are used. This mean combines in itself a doorbell, an intercom and the mechanism of remote opening-closing of an electronic lock. If the on-door speakerphone is established indoors quite enough to place it in the plastic case, and the case is necessary for its attachment outside before an entrance door from corrosion-proof metal. .