Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good product if it worked

Shipped product was defective. It generated high pitch feedback noise in the right speaker when the noise-canceling was on. Had to return to Warehouse. They should have never shipped a defective unit. Beware: they can take it back but can not provide replacement although their return policy is stated to be identical to Amazon.The headphone had a nice box, good fit and good material construction.