This keyboard is awesome! I used it like 10 years ago and when a few keys stopped working., I put it in a box for later. I didnt try to fix it. selling as is. needs cleaning.update. i plugged it into my laptop to try to test it out. initially the c key was sticking. i hit it a couple times and it stopped. that key is working in notepad. every key seems to work in nopad, except for the right shift key. i don't play video games so I didn't test out all the left hand keys, but they do show values in notepad when I click on them. the audio pass through seems to work, but I didn't try the microphone. when I try to use stuff in the u s borts, it says insufficient power.If you would like to call me or do a video chat. I'm more than happy to run through some tests for you. once again i'm selling it as is. i'm testing it the best I can. reach out to me if you have any questions or want me to test anything exactly.