Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Engineered Failire

I have owned two(2) pair of these EARS, and neither had any TONE CONTROL. The first pair also broke the STEM off at the receiver. I sent the second set back for a refund, only to find someone who can apparently hear, to tell me that there is nothing wrong with the tone control. Well, I'm the one who bought the Ears because of the Tone Adjustment, because I have the problem and you don't. You turn a knob and see meter movement and tell me. I'll tell you that your EARS don't have enough "TREBLE" and that is YOUR problem, in that fact that your EARS will not be bought by me again.Oh, I didn't send the first set back because of the same kind of a story I just got about the TONE CONTROL.LK