So I got it for a week now and is easy to suuuuper bedinenen, even if you hold the loud quiet regulator oppressive that it is faster then quietly is super! but ... unfortunately the speaker to the 7,2Volt from USB port are I think quite overwhelmed! So, you can not make wirlich quiet, even from very quietly to very loudly is not the difference so extreme because the device already on very quietly powert zimlich! All in all hammer ding! Class surround effect! greetz -a owner