Electret microphone cardioid or hypercardioid change is effected by mounting / dismounting a small room on the capsule.
Micro am saying extremely versatile for stage or studio (acoustic guitars, percussion, voice ...)

OVERALL OPINION

In retrospect, my innocence in this matter has perhaps lost the seller, I wanted to use a micro-Home Studio, and to record mainly guitar and voice, in a relatively noisy (campaign, but two kids in the house ...).
He had to imagine they were cycling in the next room, from which the specifics of the microphone!
In the end, I used 3 months and then exchanged at the store against a Behringer B1 that is exactly my case, hello the deadweight loss (a factor of two).
In short it was my first microphone, and I screwed it remains to be tested in other circumstances (it seems that in Exelle transplanting live acoustic guitars! To see ...)
For me, the sound card, tubular, very medium, short unsuitable for use for home studio taken voice and guitar.