The calculator features all the important scientific, statistical and trigonometric functions. Pad key features large keys with high visibility printing. Color differentiated operation keys. Automatic power down when left unattended. Fully portable 9" x 6.2" x 1.5"-just 14 ounces. Operates on a replaceable watch type battery (included). Comes with a large print (16 pt.) users manual. See model number 221004 for an English and Spanish talking version of this calculator.