The remarkable Braille Star 40 is truly the alpha-star for a new generation of braille displays. Features include 40 concave "easy read" braille cells, 40 cursor routing buttons, External keyboard input and output, USB and serial connection, 4 MB memory (4,000 pages of text), 2 triple action navigation keys, 8 function keys, 20 hours of use per charge, and a quick charge time of 3 hours. Dimensions are 13.2 in. wide x 13.5 in. deep x 1 in. high. Slider is extendable to 13.4 inches. Weights 3.08 lbs. Comes with a 1-year warranty.