Instruct: Classify Amazon reviews into positive or negative sentiment
Query: One I bought had defective jack

I bought one of these as a Christmas gift for my wife. The jack on the one we received was defective. When you plugged in the earbuds that came with the unit, you had to spin the plug in the jack to find the magic spot that made the connection -- but even then the connection did not hold. We tried another set of earbuds and high-quality headphones with the device, without success: The defect was clearly in the jack of the MP3 player. We requested a refund and the Amazon return procedure went off without a hitch -- so 5 stars for Amazon but only 1 for the Samsung YP-K3JAB (only because you cannot rate an item as zero stars!).