Your device becomes a rear camera monitor when used with Voyager transmitter.
Voyager Vision — description
Turn your device into a rear camera monitor for use with the Voyager WVOS2TX wifi transmitter and wired Voyager camera. The transmitter delivers the camera image directly to the Voyager Vision app when backing up. The system was specifically designed for reversing at low speeds, perfect for construction sites, campgrounds, and boat launches.