Business & Office Electronic Handheld 8 Digit Calculator With Sound and Off Button, Tilted Screen For Easy Reading, Two Way Power. By Stationary Station OFFICE & BUSINESS CALCULATOR: Tilted screen for easy and accurate screen reading. Great compact size- easy to carry, handheld calculator. FEATURES: The sound and off button, which are rare on other calculators. Extraction of square root, profit margin, %, +/-, 8 digit screen display- indicates your numbers in clear, dark lettering. DUAL POWER SOURCES: Solar and Battery. SOUND: Our calculator features the sound button, which can be turned on and off, according to your liking. It has the perfect tone beep sound to let you know when the numbers are registered, without looking. MEASURES: 5  L x 4  W x  H inches + 1 inch lifted display screen. PREMIUM QUALITY: This is made of High quality material and well constructed. Very durable to last you a long time! 18 MONTH MONEY-BACK GUARANTEE! Stationary Station is a brand you can trust. If you are not 100% satisfied with your purchase we will issue you a full refund- hassle free!