Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great -until it stopped working!

I loved this headset, it was so easy to use, and had great sound quality. Having my hands free allowed me to get things done around the house while chatting on the phone and then one day the microphone stopped working. I heard, "What?? I can't hear you!" They heard nothing. I have had this headset for 2 months and it is still under warranty, so I will call the 800-number and see what can be done.