Display Characters x Lines 10+2 x 2. Formula Notation Algebraic. 3-Key Memory. Storage Memory 7. Variable Statistics Two. Levels of Parentheses 16. Fraction Calculations. Fraction/Decimal Conversions. Multiline Equation Playback. Probability (Random Numbers). Battery Powered. Size 3-1/8"Wx6-1/8"D. Replacement Battery DURDL2016BPK (sold separately). Portable calculator with glass top design and alphanumeric LCD display. Protective hard case and operating battery included.