Nice basic scientific calculator, with a snap on cover, at very nice price. I was upgrading from a venerable Sharp scientific that is probably 20 years old. The big improvement in the functionality is that this calculator has three memories (STO  1,2,3  and RCL 1,2,3) whereas the Sharp had just one. This upgrade does, however, require two an additional keystrokes just to save and recall one value. Values stored in the three memories are retained when the calculator is powered off.