What’s the meaning of Ultra resolution? It’s for enhanced Field of View (FoV). If turned on, the camera will have a wider view angle. Related articles Why does the camera become so hot when it's recording? (YI 4K+ Action Camera) How do I select 4K 60fps? What are the requirements for my microSD card?(YI 4K Action Camera) No Cloud Service Which FOV viewing angle mode can be available under each video resolution in the camera?