function rule calculator

1)durable plastic key. 2)ECO-Friendly 3)big screen 4)auto-power-off.

description

check and correct electronic calculator Autumn Festival

1)12 digits and correct calculator.

2)the check key and correct key can modify the wrong inputted numbers.

3)dual power supply ( solar and battery).

4)99 steps reply to check each process. and it can correct the mis-input .

5)it switch the power off automatially if there has been no key entered for about  5 minutes.

6)it seems clearly with big screen.

7)magnet on the back.

   

function rule calculator