As far as the socket itself is concerned, 硧 is directly connected to 220 volts, but in fact it is not directly connected to 220 volts. If you open the socket, you will find that there are circuit boards and many electronic components inside. In fact, it is a charger, but the circuit is made inside the socket. It's essentially the same as any charger.
That's right, because the average household voltage is 220 volts.