| 摘要 |
A mobile device includes a main body having a coupling element mounted thereon, and an expansion module electrically connected to the main body, wherein the expansion module comprises a magnet disposed to apply a magnetic force to the coupling element to couple the expansion module with the main body, and a movement converter configured to move the magnet away from the coupling element so as to decrease the magnetic force between the coupling element and the magnet thereby decoupling the main body from the expansion module.
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