Sci-Plus Series 300 Scientific Calculator With Speech is a large display and voice output calculator designed for use by individuals who are blind or have low vision. This calculator has selectable speech output and a high-contrast liquid crystal display (LCD), and performs scientific, statistical, and trigonometric calculations. Its positive activation keypad has enlarged, proportional numerals with color-differentiated operation keys. Other features include a rugged, portable case, volume control, and an external jack for speaker or headphones. A large print owners manual and earbuds are included. Available in English, French and Spanish language. POWER: Uses lithium-ion battery or standard current. A country-specific power adapter and universal recharger are included. Additional country-specific plugs are available on request. DIMENSIONS (HxLxW): 1.3 x 6 x 9 inches. Keys are 0.7 inches wide with numerals measuring 0.9 x 0.6 inches. WEIGHT: 14 ounces. COLORS: Ruby red, blueberry, cash silver, bumblebee yellow, or lime green case with black number keys and blue arithmetical operation keys. Numerals and arithmetical operation signs are white; other operations are white or yellow. WARRANTY: 1 year warranty.