A self-contained wireless camera and a wireless camera system having such a device and a base station. Therefore, the permanent magnets can be easily affixed to the inner side of the individual barriers, and the loss of the magnetic fluxes is minimized, thereby improving the efficiency of the rotor. The surface further is coated with an electrically conductive, corrosion resistant coating. The system will extend component end of life and provide a controllable constant pressure improving image quality for superconducting MRI magnets.