The following is a guide to to the 10" Samsung terminal.
Ethernet Cord: This cord supplies an internet connection without the need for wifi. *note: even if wifi is not in use, the wifi on/off toggle in settings should always be set to off!
Credit Card Reader: Swipe a credit card here to pay for a transaction. There is a green light that will be visible if the reader is connected to power.
Hub: This device combines signals from ethernet, power, and the card reader, and combines them into one cable that plugs into the Samsung tablet.