For Daily And Basic Office Use, Consider The Offidix Large Key Calculators Product Details Comfortable Computer Key Buttons: The Special computer key button is higher than the common computer and it increases the resiliency of this button. It cannot be stuck easily during you use it. The big figure button can help the aged seeing clearly and using it happily. Enhanced LCD Display Screen: We use the specially modulated pigment for the display screen which improves the clarity of the display screen greatly. Dual Power Energy Saving: The powers are battery and solar (one AA battery NOT included). The Solar design make the calculator can work in daytime or even in the dim light without battery. Special Functions: When you would like to calculate the number, it will express the symbol (plus, subtract, multiply or divide) on the screen. It can help you seeing the operation step when you operate continuously Apply For: It perfects for office, business, school, store, mall and home use. It supports touch typing by user such as bank stuff, financial worker, front Desk clerk and data analyst etc. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.