The SpeedFace-V4L Pro series uses intelligent engineering facial recognition algorithms and the latest computer vision technology, featuring a video intercom function.  What sets the SpeedFace V4L Pro apart is its 4-inch color LED touch screen, a 2MP binocular camera, a built-in microphone, and a speaker for two-way video communication. There are two ways to use video  intercom functions. Firstly, users can have a video phone through the ZSmart app when connected to the internet.