Input device assembly with support pad

An input device assembly, comprising:

• a support pad comprising a first main body, a first magnetic attraction element, and a protrusion post, wherein the first main body has a first bottom surface and a first curvy surface, wherein the protrusion post is protruded externally from the first curvy surface, wherein the first magnetic attraction element is disposed within the protrusion post, and
• an input device comprising a second main body, at least one second magnetic attraction element, and a guiding groove, wherein the second main body has a second bottom surface and a second curvy surface, wherein the guiding groove is inwardly and concavely formed in the second curvy surface, and the protrusion post is movable within the guiding groove, and the at least one second magnetic attraction element is disposed within an inner side of the second main body and located near the guiding groove,
• wherein the first curvy surface of the support pad is contactable with one of plural portions of the second curvy surface of the input device, and the first magnetic attraction element and one of the at least one second magnetic attraction element are magnetically attracted by each other, so that the support pad is in close contact with the input device.