Go to the Settings page and tap Device Management to view the list of available card readers and printers that your device can be connected to.
If you are using a Swift B200, Swift B250, or an Ingenico B350, the four digits represent the last four digits of the card reader’s serial number.
Set Default Devices
To pair and set a reader as the default reader for your device, simply tap on the reader name as listed in Device Management
To set a default printer, select the printer by tapping on it and then tap Set Default Printer
To print a test receipt select a printer and tap Print Test Receipt.