The code on the side of the charging port on the switch is used to verify the version of the console, which is called the sequence code. The beginning of the sequence code can be cleared to see whether the console is a battery life or non-battery life version, which version and other information. For example, the Switch battery life version model is HAC-001 (-01), that is, it is added after the cash (-01), the serial number has begun with XKW, and players must pay attention to it when buying a new one.