Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Missing parts

I returned this product the same day I received it. It's missing the "high heat" plastic disc that goes in the bottom, and they never sent instructions. I had to do my own research to even learn that there was a missing part. Basically, I was sent a product that was not even usable. Too bad, because it looks like it would have been a nice product.