a jet device includes a base container in which a cover plate is mounted to define a chamber . a fan having blades is rotatably received in the chamber and includes internal magnetic elements mounted thereto . a drive unit including an electric motor is mounted externally to the base container and includes external magnetic elements that are driven by the electric motor to rotate about an axis . the internal and external magnetic elements correspond to each other and magnetic attraction forces are generated therebetween to drive the internal magnetic elements to rotate in unison with the external magnetic element so that the fan is rotate to induce a flow of liquid in the chamber . the flow liquid is guided to pass through holes formed in the cover plate to form jets of liquid above the cover plate . a top housing is mounted to the base container to confine the liquid jets .