Instruct: Classify Amazon reviews into positive or negative sentiment
Query: unreliable

I am very frustrated with this product. I must use a voice recorder for my counseling psychology classes and internship and this one has never worked correctly. I thought I had it figured out and it was just me, but today I can hardly get it to work. I hope my grade in class does not suffer as a consequence of not having a tape. Also, it is a standard size cassette, not mini.