One name here, two quite different products. For a flat or a house the simplest answer is an Imou video doorbell kit (DB-2SP, DB-3EP) that sends the picture straight to your phone. Apartment blocks and offices are served by IP door-entry panels with a 2 MP camera and separate 7- or 10-inch indoor monitors, which run on the SIP protocol and are powered over PoE. In the second case you need to know the number of subscribers and the mounting type — flush or surface — in advance.
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One name here, two quite different products. For a flat or a house the simplest answer is an Imou video doorbell kit (DB-2SP, DB-3EP) that sends the picture straight to your phone. Apartment blocks and offices are served by IP door-entry panels with a 2 MP camera and separate 7- or 10-inch indoor monitors, which run on the SIP protocol and are powered over PoE. In the second case you need to know the number of subscribers and the mounting type — flush or surface — in advance.