Magnetic auxiliary devices for mobile devices

A magnetic card holder device for mobile device, comprising:

• a rear case sized to retain a card, the rear case comprising:
• a pocket portion to hold at least one card;
• a release mechanism formed on a side of the rear case;
• and
• a first metal plate formed at a position of the rear case to magnetically couple with the mobile device or a case of the mobile device;
• and
• a cover case pivotally attached to the rear case and pivotable between an open position and a closed position, wherein the rear case is uncovered in the open position and the rear case is covered in the closed position, the cover case comprising:
• a second metal plate formed at a position of the cover case to magnetically couple with a support device,
• wherein the release mechanism retains the cover case in the closed position and the release mechanism releases the cover case in the open position,
• wherein when the first metal plate is directly coupled with the case of the mobile device, the first metal plate is to couple with a third metal plate formed in the case of the mobile device,
• wherein the third metal plate is made of a magnet which produces magnetic flux,
• wherein the third metal plate is to allow magnetic waves to pass through an area formed by an inner boundary of a receiver coil of the mobile device, and
• wherein the third metal plate does not overlap with an orthographic parallel projection of the area formed by the inner boundary of the receiver coil.

A magnetic auxiliary device for mobile device, comprising:

• a first case sized to store at least one item, the first case comprising:
• a first metal plate formed at a position of the first case to magnetically couple with the mobile device or a case of the mobile device;
• and
• a second case pivotally attached to the first case and pivotable between an open position and a closed position, wherein the first case is uncovered in the open position and the first case is covered in the closed position, the second case comprising:
• a second metal plate formed at a position of the second case to magnetically couple with another magnetic auxiliary device for mobile device,
• wherein when the first metal plate is directly coupled with the mobile device, the first metal plate is to allow magnetic waves to pass through an area formed by an inner boundary of a receiver coil of the mobile device and the first metal plate does not overlap with an orthographic parallel projection of the area formed by the inner boundary of the receiver coil.