Summary: Mine died last weak, did not last long , i had it Just little over a month the 30 days was gone so I lost on this one here . I have a pocket size from June 1987 and that one still works. School Days and still works.
Summary: Mr. Boston is correct. There are no readable instructions included with the "adding machine." You are on your own in figuring out the machinations of adding and subtraction. Canon's technical writers use 5 point type and miserable tiny drawings which fail to provide basic learning guides to the calculator's operation.
Summary: I was unaware there was anything called an "adding machine" and learned this the hard way. I wanted a basic calculator with large buttons and the ability to print if I needed it to. I have two home based businesses, and thought I'd benefit from something with a little more heft to it. Unfortunately, I am a mathematical buffoon, so I thought this calculator was broken when I first tried it.