Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Headphone part works intermittently

I bought 2 sets of these as presents. They worked fine for a while, but now both have the same problem. I can't get any sound in the headset itself, or only intermittent sound. The microphone picks up sound well, but the way I currently have to use them, with the headset around my neck and the mouthpiece pointing up, isn't exactly practical. I wouldn't recommend this product.