This full function calculator features a giant 8-digit display & a clear, easy to understand female voice. Also features repeat, memory, auto power shut-off, & adjustable volume. Audio result may be given in either units or by digit. Uses 2 AA batteries (not included). 1/2" black numbers. 90 day warranty. Product dimensions (imperial): 5.5 inch H x 7 inch L x 1.5 inch W Product dimensions (metric): 139.70 mm H x 177.80 mm L x 38.10 mm W