The Casio fx-7400GIII is a graphing calculator with 10 digits precision and formula input logic. It has 406 functions, 50 keys, and an LCD (liquid crystal) display. The power source is 2xAAA + CR2032. The calculator was manufactured in China. Note: Updated version of fx-7400GII
Facts at a glance:
|Power Source||2xAAA + CR2032|
You can download the Casio fx-7400GIII manual from this external link.
If you have a Casio fx-7400GIII that is no longer working, you can first try replacing the 2xAAA + CR2032 batteries. If that doesn't solve the problem, then a repair might be possible, although you have to weigh up the costs against just buying a new one, as this model is still currently available.