Expansion device

An expansion device comprising:

• a supporting base, comprising a bottom portion, a supporting portion, and an electrical connection port, wherein the supporting portion is connected to the bottom portion and has an insert slot, and the electrical connection port is disposed at the bottom portion;
• a hub, slidably disposed within the supporting portion and located between the bottom portion and the insert slot, the hub comprising a first electrical connection element, a second electrical connection element facing away from the first electrical connection element, and a first positioning portion adjacent to the second electrical connection element, wherein the first electrical connection element is electrically connected to the electrical connection port, and the second electrical connection element and the first positioning portion are oriented toward the insert slot;
• and
• an adapter, detachably disposed at the hub and located between the hub and the insert slot, wherein the adapter comprises a third electrical connection element electrically connected to the second electrical connection element, a second positioning portion adjacent to the third electrical connection element, and an electrical connection plug facing away from the third electrical connection element, wherein the first positioning portion directly faces the second positioning portion, and the electrical connection plug extends into the insert slot.