A multimedia card , comprising a substrate , eight contacts (1 - 8), a transformer circuit disposed on the substrate , a control chip , and a memory chip , wherein the eight contacts (1 - 8) are disposed on the substrate , wherein the multimedia card comprises a first edge (L2), a second edge (L4), a third edge (L3), and a fourth edge (L1), wherein the first edge (L2) is parallel to the second edge (L4), wherein the third edge (L3) is parallel to the fourth edge (L1), wherein a distance between the first edge (L2) and the second edge (L4) is a first distance, a distance between the third edge (L3) and the fourth edge (L1) is a second distance, wherein the first distance is greater than the second distance, wherein a contact of the eight contacts (1 - 8) is a power supply contact configured to receive a first voltage (V1), and wherein the power supply contact is coupled to the transformer circuit , and the transformer circuit is configured to convert the first voltage (V1) into a second voltage (V2), characterized in that : four contacts of the eight contacts (1 - 8) are distributed along the first edge (L2), and the other four contacts of the eight contacts (1 - 8) are distributed along the second edge (L4), the control chip and the memory chip are covered with a packaging layer , and when the multimedia card works in a HS200 mode, the memory chip receives the first voltage (V1) from the power supply contact, and the control chip receives the second voltage (V2) from the transformer circuit . wherein the eight contacts (1 - 8) are disposed on the substrate , wherein the multimedia card comprises a first edge (L2), a second edge (L4), a third edge (L3), and a fourth edge (L1), wherein the first edge (L2) is parallel to the second edge (L4), wherein the third edge (L3) is parallel to the fourth edge (L1), wherein a distance between the first edge (L2) and the second edge (L4) is a first distance, a distance between the third edge (L3) and the fourth edge (L1) is a second distance, wherein the first distance is greater than the second distance, wherein a contact of the eight contacts (1 - 8) is a power supply contact configured to receive a first voltage (V1), and wherein the power supply contact is coupled to the transformer circuit , and the transformer circuit is configured to convert the first voltage (V1) into a second voltage (V2), characterized in that : four contacts of the eight contacts (1 - 8) are distributed along the first edge (L2), and the other four contacts of the eight contacts (1 - 8) are distributed along the second edge (L4), the control chip and the memory chip are covered with a packaging layer , and when the multimedia card works in a HS200 mode, the memory chip receives the first voltage (V1) from the power supply contact, and the control chip receives the second voltage (V2) from the transformer circuit . four contacts of the eight contacts (1 - 8) are distributed along the first edge (L2), and the other four contacts of the eight contacts (1 - 8) are distributed along the second edge (L4), the control chip and the memory chip are covered with a packaging layer , and when the multimedia card works in a HS200 mode, the memory chip receives the first voltage (V1) from the power supply contact, and the control chip receives the second voltage (V2) from the transformer circuit . <EOS>