It is a system that amplifies sound so more people can hear it. This is commonly used to address a larger audience, for announcements, music and reminders.
Video Door Entry (also known as Video Intercom or Door Phone) is a stand-alone system used to manage calls made at the entrance to the building.
Smart lock always you to lock and unlock your door, create virtual keys for guests and keep track of who comes and goes all from your smartphone.
This is an advanced wire - free doorbell camera that streams crisp, realistic video of your doorstep to your phone also it is a All-in-One solutions with doorbell, chime, swappable battery and app.