When the Scan is successful, it creates a record in the Contact Check-in object. 

The record contains Check-In at, Check-In by User(Lookup field V4S Mobile User), Check out at, Method of Checkin/Out(Scan/Button) by default.

We can Configure the Scan Screen to show the lookup Object items for example(Campaign/Job/Opportunities) any Standard/Custom object. The following screen shows a configuration that has Campaigns configured in the org.