Smart doorbells are defined as Internet-connected doorbells that notify homeowners when a guest arrives at the door. Users can view the person at the door from a smartphone or tablet. The smart doorbell is activated when the guest presses the doorbell. The user is informed of the presence of the guest through in-built motion sensors. Users can receive constant alerts about actionable security risks or other key events. Smart doorbells support the feature of two-way audio communication with visitors via wireless communication technologies such as Bluetooth, Wi-Fi, and Zigbee networks.