The Fuzi C04, C04X, and C04X-1 refer to different models of Car Operation Panels (COP) and Landing Operation Panels (LOP). These are the user interfaces in Fuzi elevators:

COP (Car Operation Panel): Located inside the elevator car, these panels allow passengers to select floors, control doors, and access emergency functions.

LOP (Landing Operation Panel): Found outside the elevator on each floor, these panels provide "up/down" call buttons and indicate the elevator's status.