Newly Equipped With 300 Steps Check & Recheck Functions! Features: Recheck With Sound Assist The Recheck Function Allows Confirmation Of Errors By Sound When Checking Calculations. If The User Presses An Incorrect Key When Performing A Second Calculation To Check Calculation Results, A Buzzer Sounds To Alert The User Of The Error. 300 Steps Check Displays Up To 300 Previous Calculation Steps. Localized Number Display One-touch Switching Between Digit Separator Formats Extra Large Display Larger Display Makes More Data Easier To Read Two-way Power (Solar + Battery) Solar Powered When Light Is Sufficient, Battery Powered When Light Is Insufficient. Key Rollover Key Operations Are Stored In A Buffer, So Nothing Is Lost Even During High-speed Input. Plastic Keys Designed And Engineered For Easy Operation. Profit Margin Percent "% " Key Gives Quick Access To Prices And Profits, And Also Delivers Add-ons, Discounts, Ratios And Increase/Decrease Values. Function Command Signs A Symbol (+, -, x, ) On The Display Indicates The Status Of Operation You Are Currently Performing. Mark-up All The Mark-up Capabilities Of An Adding Machine For Simplified Cost And Profit Calculations. Grand Total Automatic Tantalization Of The Results Of Different Calculations. Go To Button Jump To A Particular Calculation Step By Pressing One Single Button. Recheck With Sound Assist. Solar Battery 12 Digits Screen Size: 27.5(w) X 94(l)mm.