Nikon D780 DSLR Camera (Body Only) - Manual (Page 51)

5 Getting to Know the Camera
D The Connector Covers
Be sure to close the covers when the connectors are not in use. Foreign
matter in the connectors could cause malfunction.
D The Speaker
Close proximity to the speaker could corrupt data stored on magnetic
stripe cards or other such magnetic storage devices. Keep magnetic
storage devices away from the speaker.
D The Monitor
The angle of the monitor can be adjusted as shown.