The wallet, which is controlled via a smartphone app called Zaim, flees from its owner on four tiny wheels when set to "save mode" and cries out "don't touch me" and "help me" once it is caught, Japan Daily News reported Monday.
The wallet then sends an email to the persistent owner's mother warning her of the impending spending.
The Zaim app keeps track of the user's spending to help root out unnecessary shopping and impulse purchases.
The wallet also has a "consume mode" setting that leads it to play Beethoven's "Symphony No. 9, 4th Movement" in lieu of fleeing or calling for help.