Two-way Power: Solar and Battery</br>Large 8 digit display</br>Desktop calculator</br>Tax and Currency conversion?? Function and Command Signs</br>On and Off buttons?? Profit margin %?? +/-?? Key Rollover</br></br>Product Description</br></br>This general purpose desktop calculator is perfect for home or office. Solar Plus power works even in dim light. <br><br> <li>8-Digits (16-digit approximations)</li> <li>Tax & Currency Exchange function</li> <li>Silver-metallic finish</li> <li>Large easy-to-ready Big Display</li> <li>Constants for +?? - ?? x?? ??</li> <li>Independent memory</li> <li>Mark-up percent?? +/-</li> <li>3-digit comma markers</li> <li>Solar Plus with battery back-up</li></br><br/>http://www.amazon.com/gp/product/B003822IRA