A: card slot size: 5.5 mm long; 1.5 mm wide, 3 mm deep hole

B: card slot size: 5 mm long; 1 mm wide, 1.5 mm deep hole
C: Card slot size: 4 mm long; 1 mm wide, 2.5 mm deep hole
D: card slot size: 6 mm long; 2 mm wide, 1 mm deep hole

 A款展示：

B款展示：

C款展示：

-|-_-|-D款展示：