A video door phone (VDP) is a communication device that allows you to see and talk to visitors at your door without having to physically open it. It typically consists of two main components:

1. Outdoor Unit (Camera/Intercom): Mounted at the door or gate, this unit includes a camera, a microphone, and a speaker. It captures video and audio of the visitor outside.

2. Indoor Unit (Monitor/Receiver): Located inside the house, this unit consists of a screen (usually LCD or LED) to display the video feed, along with a speaker and microphone for two-way communication.