Handheld Printing Calculator is designed for light to medium use in the home or office. Prints one color at approximately 1.6 lines per second. Features 12-digit liquid crystal display (LCD), and tax function. Four-key memory includes memory plus, memory minus and recall/clear memory keys. Other functions include tax + and tax keys, adding mode, constant and double zero key. Operates on four AA batteries (included) and AC adapter (optional).