Touchscreen Display: The indoor unit usually has a touchscreen display that allows you to view live video feeds from the outdoor camera and interact with visitors.
Audio and Video Communication: It enables two-way audio and video communication, allowing you to speak with and see the visitor at your door.
Built-in Speaker and Microphone: You can hear the visitor's voice through a built-in speaker and respond using the built-in microphone.
Door Unlocking: Some units have the capability to remotely unlock the door for the visitor if it's integrated with an electric door lock or access control system.
Touch Button or Keypad: Depending on the model, you may have physical touch buttons or a keypad for various functions, such as answering calls, adjusting settings, or unlocking the door.