The SL-300SV is a heavy duty pocket calculator which has an extra large and clear 8 digit display. It?s dual powered (solar with battery backup) and functions include profit margin %. Additional features include plastic keys, command signs , 3 digit comma markers , 4 constants, auto power off and comes with a wallet for protection. Specification * 8 Digit Large LCD Display * Heavy Duty Professional Pocket model * 4 Key Memory * Solar Powered (with battery back-up) * Percentage and Square Root Keys * Change sign Key * Extra large Key * Alternative models If you require a high functionality in a compact format try the SL-300VC
