LOHOME Large 12-digit Electronic Calculator - Battery & Solar Powerd Standard Function Desktop Business Calculator with LCD Display Screen for Home & Office Use EXTRA-LARGE LCD DISPLAY: Extra large 12 digit and tilted screen display for easy and accurate screen reading, improve your working efficeiency. Common keys like mark up keys and grand total keys meet the standard function of the calculater. HUMAN & COMFORTABLE BUTTON DESIGN: Durable silicone button, never fade. Computer digital button array is in line with the use of human habits. Radian buttons give a comfortable tactility. DUAL POWER: Solar or battery-powered for all lighting conditions, long battery life. Never worry about powering off when you are working. Auto power-off make it energy saving. PRACTICAL ADDING MACHINE TYPE CALCULATER: 6.3'' x 6.2'' x 1.6''(L*W*H) big size and anti-slip foot pads fit on the desktop, perfect choice for office buesiness and home use. Quick and easy tax calculation. LOHOME WARRANTY: 30-Day Money Back Guarantee and 180-Day Product Warranty. If you have any issue with your product, contact us and our team will respond to you within 24 hours!