Stationary receipt printers
The selection of stationary printers is where things get a bit complicated (and where Square’s own guides are confusing). With a mobile printer, Bluetooth is most convenient – no wires, no fiddle as you carry it around. Desktop receipt printers, on the other hand, have a wider choice of connection points including:
LAN by cable – Connects by Ethernet cable to your local router that connects with the Square app over WiFi.
Wireless LAN – Connects directly with your mobile device’s WiFi.
USB – Connects directly to the mobile device running the Square app.
Bluetooth – Connects directly to your mobile device over Bluetooth.
To add to the confusion, the USB connections can only work with iOS if you also use an iPad with the Square Stand which has a socket for this. The USB connections do not work with iPhone.