The DoubleCheck XL Talking Low Vision Commercial Calculator allows the user to hear both the digits pressed and calculation results spoken as well as viewing them on the LCD display with extra-large 1 digits. It combines basic commercial and conversion functions in one device. FEATURES AND FUNCTIONS: - Extra-large display with 10 big digits - Extra-large buttons (15 x 15 mm 0.6 x 0.6 in) - 10 memory spaces - Reciprocal value - Percentages - Square raise to higher power and extract roots - Calculation of compound interest cash values and annuities - Conversion of currency and physical units - Date and time with alarm clock function SPECIFICATIONS: - Headphone jack 3.5 mm mono/stereo - Power supply 4 x 1.5 V AA batteries or mains adapter - Mains adapter socket 3.4/1.35 mm coaxial power connector - Operating temperature 0-40 degrees Celsius - Color: Royal Blue - 2-year manufacturer s limited warranty - Includes four AA batteries and printed user manual Dimensions (l/w/h): 210 x 170 x 45 mm (8.3 x 6.7 x 1.8 in) Weight: 1.1 lbs. (including batteries)