Trust HS-100p echo chamber effect
i plugged it into the rear pink mic-in port. when i use the sound hardware test wizard i see how the recording meter shows that it recivies voice. then i click next and get the playback meter, when i talk in it i can hear it from my speakers. i only say one word but it starts to reapeat the same word getting louder each repeat and i stop it by lowering the playback volume.
then i used the Teamspeak software client where you also can test it and exactly the same happens, it starts to echo the same sound.
i use the inbuilt soundcard in my Asus P5LD2 mobo and theres no drivers for the headset.