I picked up a camranger mini for my wife for christmas to use a a director’s monitor for a dslr.
The Device is mainly used to control a dslr for still photography, but also works for video, though at a very low frame rate. It is works by connecting a small device to your dslr via a USB cable and then connecting your iOS or Android device via wifi. And you can nominally control the camera from the device.
As a director’s monitor it works from framing, but not performances as the frame rate is just too low.
Still cool to be able to see without an attached monitor, especially if the camera is in motion, but a higher frame rate would be welcome.
Maybe the announced Camranger 2 which comes out this year will do better.