Yeah, at first, I thought it was a calculator/adding machine. It was about 8" long x 5" wide by 3" thick (~20 cm x 13cm x 8 cm), with a roll of paper at the top (the plastic cover was off, but I could snap it back on), but the paper roll was smooshed. It had a slot at the bottom to stick the card in and an biggish LCD screen.
My SIL has one for running charges at crafts fairs where she sells her jewelry.