Portable thumb units were used in 2015 to collect donations and other funds where a person was unable to access a teller. One such charity collector was Terry, representing the Hill Valley Preservation Society, who came up to Marty McFly asking for a $100 donation to save the Courthouse.

AppearancesEdit

• Back to the Future Part II
• Back to the Future Part II novelization (First identified as Portable Thumb Unit)