TI-1706SV Handheld Pocket CalculatorWell equipped with SuperView display and solar/battery power for use anywhere. Color-coded keyboard with extra-large, easy-to-use keys. Protective slide case stores on back until needed. Change sign (+/-) key simplifies entry of negative numbers. Square root key is useful for schoolwork. Power Source(s): Battery;Solar; Display Notation: Numeric; Number of Display Digits: 8.