the first limiting bottom wall is connected to the first limiting sidewall, and the first limiting bottom wall is configured to extend toward the card slot adjacent to the first limiting bottom wall.

According to some exemplary embodiments, the shielding cover accessory further includes a plurality of second openings, and the plurality of second openings are respectively arranged in the plurality of recesses.

According to some exemplary embodiments, the shielding cover accessory further includes a plurality of second limiting portions, the plurality of second limiting portions and the plurality of first limiting portions are configured to protrude in the same direction relative to the flat bottom, and the plurality of second limiting portions are respectively arranged at the plurality of second openings.

According to some exemplary embodiments, each second limiting portion includes a second limiting sidewall and a second limiting bottom wall, the second limiting sidewall is perpendicular to the flat bottom, and the second limiting bottom wall is parallel to the flat bottom;

the second opening has a second opening sidewall close to a center of the shielding cover accessory, and the second limiting sidewall is connected to the second opening sidewall; and

the second limiting bottom wall is connected to the second limiting sidewall, and the second limiting bottom wall is configured to extend toward the center of the shielding cover accessory.