Instruct: Classify a given review into positive or negative sentiment.
Query: Broken microphone, right out of the box - twice

Everything fine with these, comfort, sound is adequate, but we've had two sets with broken microphones. Tried on several machines (mac), all same.The first unit failed after a couple of days of use, the second one had an inoperative mic right out of the box. Returning for a refund this time, not willing to waste any more time.