I was listening to the sound from the mars wind. the unfiltered version sounds like switchers ?? Or is it some motor runing?
Ah, electret, but expensive!!! 1890 Euro excl. local VAT (about 2k$).
So for 1 $ you a can get a cheap electret, NASA budget needs rethinking! Now all we need is a Martian showing there is intelligent life there by grabbing the mike and saying / singing something.