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Door intercoms help residents and visitors to an entire house to contact the inhabitants of the house through the exterior door. They are basically hardwired systems that have to be installed by professionals who are knowledgeable about their installat...

Don't trust your child with the door intercom, unless it's only used to alert them of an intruder or there is no one else around. Unlicensed installations and those that are installed by unskilled personnel may pose serious safety risks. The door inter...