Surprise your family and friends with the funny clever replies to their math equations with our Crazy Calculator! Fool your friends, family, co-workers… even the tax man! The calculator has two modes, normal and crazy, which can easily be set back and forth. When in crazy mode, get ready for the laughs as the LCD panel reads lines like, “R U SERIOUS” or “YOU TELL ME”!Our Crazy Calculator uses dual power operation which is solar power with back-up battery for low-light situations. Powers off automatically after 90 seconds of inactivity.Measures 4.5 inches long x 3.5 inches wide.