Victor Technologies 12-Digit Printing Calculator, Portable, 4"x8"x2"Portable printing calculator features a 12-digit LCD screen and prints 2.0 lines per second. Functions include tax +/- keys, three-key independent memory keys, cost/sell/margin keys, backspace key, date/non-add, percent key and automatic constants. Design offers a swing-out paper arm to hold standard 2-1/4" wide paper. Calculator offers AC/DC operation with the included AC adapter. The required four AA batteries are not included. Calculator automatically shuts off after six minutes.