Standard Scientific Calculator, 2 Lines Engineering Scientific Calculator with Slide Off Case

More details: Dimension: 6.1inch*3.15inch*0.71inch(15.5cm*8cm*1.8cm) Net weight: 4.71OZ (135g) Screen size: 2.36inch*0.79 (6cm*2cm) Powerful Functions: Basic math calculate: + - * /,etc Senior school use: fraction calculations, Statistical calculation with STAT-Data editon Same Keys more functions: free convertion from shift key. Replacement button battery? Product warranty: 18 month.(not including battery) Free customer service, if you have any inquiry or problems, please feel free to contact us.