BrandTexas Instruments ColorBlack Calculator TypeGraphing Power SourceBattery Powered Screen Size3.5 Inches Number of Batteries4 AAA batteries required. Color Screen. The screen size is 320 x 240 pixels (3.5 inches diagonal) and the screen resolution is 125 DPI; 16-bit color Rechargeable battery included. Can last up to two weeks on a single charge Handheld-Software Bundle. Includes the TI-Inspire CX Student Software delivering enhanced graphing capabilities and other functionality. Thin Design and lightweight with easy touchpad navigation.Quick alpha keys Six different graph styles and 15 colors to select from for differentiating the look of each graph drawn