You MUST have onsite wifi for most of the features to work. You'd better hope you don't have problems, because customer support (at least in my case) was unable to help. The only option for a scanner is on a mobile device, so don't let the phone owner take it out of the booth, or no more lead capture. If wifi is spotty it will drain your phone battery, so no more lead capture that day After hours of trying to solve an issue on downloading my leads, I finally had to SCREENSHOT each of my leads from the app and type them in manually, the Cvent staff was unable to solve the problem