-I did a bit of review reading and found one of concern about too much bass. Initially I agreed, but like any quality sound product there is some setup of the devices. After connecting to my laptop and looking for the EQ, I made a few adjustments and these sound amazing!
-Works without a battery; Great sound quality; Great build quality; Great fit and comfortable to wear; Awesome noise cancellation
-Only one audio cord included; the QC15's included two; 1 for cell phone use and 1 for just audio -No 1/4in adapter