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Intercom systems can help identify visitors to your home. Those with usable sight can see their visitors with a video intercom. They also can be set up to give sound and text notifications when the doorbell is pressed or when movement is detected in a predefined area (setup may require sighted help) and allow remote 2-way conversation through companion apps. Some also have advanced functions that will identify object movement type, including person, animal, or vehicle, whilst some even offer person identification.
Smart-home systems integrate access, locking, cameras and alarms. Many of the smart-lock manufacturers mentioned in our keys and keyholes section offer connected security systems as do some specialist companies.