...and those with non-clicking switches usually have an internal peaker that chirps with keypresses.
Im currently typing on a Zenith XKB-2 and I have to say its amazing.
Yes, it HAD the chirping "feature". There was a post that it could be disabled with a key combo, like ALT-ESC or something, I didnt get that to work. So, a small wire soldered between the speaker leads got rid of that problem.
It looks a lot like my board, just a bit less wide. If it is the same, its Alps yellows and it has a really good metal base and heavy plastic construction. Mine also weighs more than my M I think.