MODEL- TI108TK VENDOR- TEXAS INSTRUMENTS FEATURES- Teacher kit of (10) TI108 Calculators Teacher Kit includes 10 -TI108 calculators plastic storage case classroom poster transparency and teacher"s guide in English and Spanish.* Hard plastic tamper-proof keys. * Large color-coded keys. * Extra-large equal key. * Low-light solar power; never needs batteries. * Large 8-digit LCD display. * Negative sign appears immediately to the left of the number displayed. * Impact-resistant slide case. * Addition subtraction multiplication division. * Automatic constant for all four operations. * Change sign (+/-) percent square root keys. * Capability to clear last entry and/or all entries. * 3-key memory. * Overhead projectable model available: Stokes model TI203. * Three-year limited warranty. * D&H carries a workbook for the TI108: The Essential TI108 Activity Book (STK112).