Hi JoLynn,
Thanks for stopping by! Our Event Tickets Plus plugin provides several options for checking in attendees at your events, including QR code check-ins, which let you quickly scan a unique barcode-like graphic that is generated for each ticket holder. You can read more about how this feature works on our Knowledgebase here!
QR codes can be scanned by nearly any smartphone with a functioning camera–all you need is a QR code scanner app. There are a number of free options available for all of the major platforms, and a simple search in your phone’s app store should produce plenty of useful results.
I hope that helps to clarify this feature a bit for you! Please don’t hesitate to follow up if you should have any other questions. Cheers, and thanks again!