Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Almost perfect Bluetooth Headset!

This is the clearest sounding Bluetooth set that I've ever used. The people you're talking to wouldn't even know that you're on a Bluetooth Headset due to the excellent noise cancellation. The only downside is that the ear pieces don't fit my ear, despite all of the choices. Although this model is bigger than the new one, it's worth the lower price if you can look past the ear pieces.