Abstract: A switch apparatus, includes: a base module including a base case, and a moving magnet movably mounted in the base case; and a manipulation module including a manipulation case, and a first magnet fixedly mounted in the manipulation case, wherein the moving magnet moves between a hold position and a releasable position, the hold position refers to a position in which the manipulation module is held onto the base module as an attractive force acts between the moving magnet and the first magnet, and the releasable position refers to a position in which the manipulation module is releasable from the base module as a repulsive force acts between the moving magnet and the first magnet.

Abstract: A switch apparatus, includes: a base module including a base case, and a moving magnet movably mounted in the base case; and a manipulation module including a manipulation case, and a first magnet fixedly mounted in the manipulation case, wherein the moving magnet moves between a hold position and a releasable position, the hold position refers to a position in which the manipulation module is held onto the base module as an attractive force acts between the moving magnet and the first magnet, and the releasable position refers to a position in which the manipulation module is releasable from the base module as a repulsive force acts between the moving magnet and the first magnet.

Abstract: A hydroelectric device to be placed on/in the flowing water includes a housing having a plurality of wings attached to rotate the housing by the flow of flowing water, a generator module received in the housing and having a rotating shaft that rotates by the rotation of the housing so as to convert the rotational energy of the rotating shaft into electrical energy, and flotation devices coupled to the housing so as to allow the hydroelectric generator to float in the flowing water.

Abstract: The present invention relates to a mobile terminal and a corresponding case with a shield magnet for driving a Hall IC of the terminal, in which the case can be used to automatically operate the mobile terminal simultaneously with opening and closing the case by utilizing the magnetic force of the shield magnet which is composed of a yoke and a permanent magnet and attached to the case.

Abstract: The present invention relates to a cellular phone case with a hall IC driving shielding magnet, and an object of the present invention is to provide a cellular phone case with a hall IC driving shielding magnet that a corresponding cellular phone is automatically operated simultaneously with opening and closing the cellular phone case by incorporating a yoke and a permanent magnet having specific structures in the cellular phone case to increase user convenience.