Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Too complicated.

This unit was almost impossible to operate and I was quite dissatisfied with it. The instructions were very ambiguous and not specific to this model. The first one I received did not function as it was supposed to, so I ordered another one, and it functioned the same as the first one. I finally gave up and returned it for a refund. Amazon made the return process simple for me.