It is a great machine so you may take card in lots of places around your building and it is a Bluetooth one and it has a connection with the main base unit which then calls via either internet or phone at the place.
Many are cafes or bed and breakfasts that use the latter kind of machine because they must allow persons to accept card whilst eating at dinner tables, although it can be used for many purposes.
The one that is mostly for persons that must allow card on the move and is called a mobile one. It only needs a connection from a network for people to work it. It is the machine that can be taken out and around so people can receive card throughout the United Kingdom and you'll not need a typical line.
The last one is a desktop which is for people that need to take cards in a certain place near to power plug and a phone or Ethernet plug point.