Instruct: Classify the given Amazon review into its appropriate rating category
Query: This product seems as if it's still in research mode, not completed with the kinks worked out.

The headset, is difficult to keep paired with my phone. The battery life is about 3.5 hrs. There's often an eco in the background with phone calls. It's hard to turn on and off, the up & down volume keys usually only go up or disconnect the line. I wanted to give it a chance, but I wish I could return it.