TI89TITANIUM Features: -Power source: Battery. -Display notation: Graphic. -Display Characters x Display Lines: 160 x 120 pixels. -Memory: 188KB RAM, 2.7MB ROM. -Display type: LCD. -Case: Hard. Product Type: -Graphing. Dimensions: Overall Height - Top to Bottom: -10.8". Overall Width - Side to Side: -7.6". Overall Depth - Front to Back: -2.3". Overall Product Weight: -0.99 lbs.