Given the task definition and input, reply with output. Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

I purchased this unit for its battery powered portable usage. It fails miserably as it produces so much hiss it is unusable. I mean it is poor with a captital P.The phantom power does not work when in battery mode, nor does the clipping LED's. Keep on looking if you want portability.
Negative