Instruct: Classify Amazon reviews into positive or negative sentiment
Query: RECEIVED "B" ITEM - AND THESE ARE COMPLETELY INEFFECTIVE.

I ORDERED ATHANC7.I RECEIVED ATHANC7B. I WAS WARNED BY OTHER BUYERS ON AMAZON.COM THAT AMAZON MIGHT SEND THE "B" VERSION -WHICH IS KNOWN TO BE LESSER QUALITY. THESE DO NOT CANCEL OUT NOISE! THEY ARE COMPLETELY INEFFECTIVE.I HAD HIGH HOPES GIVEN THE MASSIVE AMOUNTS OF POSITIVE REVIEWS - BUT IF YOU WANT TO CANCEL OUT NOISE - AND DON'T NECESSARILY WANT TO HAVE TO LISTEN TO MUSIC IN ORDER TO DO SO - THESE ARE NOT FOR YOU; SPRING FOR THE BOSE!!!