This is quite old, and I've had it stored in a desk drawer for quite some time. I recently started decluttering, so I decided to sell it. I went to a watch shop to get the battery replaced, and they were surprised to see that the inside of the watch was completely clean and the digital numbers were perfectly clear and black. However, the calculator part seems to have poor contact, and while it works to some extent, the numbers don't input properly. Therefore, it can't be used as a calculator. I believe the other functions are mostly fine.