What are the devices on the back of the laptop?

Di
2

Can anyone tell me what devices Bang Chan has on the back of the laptop and what they are there for?

Su

I think he somehow attached cable headers (why I don't know, maybe for more space)

In any case, the Stays plan to steal his PC xd

Ha

I guess they are external, since chan has the songs he produces on his mac and it takes up a lot of space.