Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Disappointed

The product delivery speedy and the product worked wonderfully plugged in until... I charged it for a BBQ birthday party and my to my surprise the product does not work. It only works plugged in I was trying to get intouch with someone through the warrenty but it is also dam near impossible. I will have to wait until the 4th of July is over to be able to get it fixed. So much for my booming sound system for the holiday weekend,Disapointed CustomerION Block Rocker Battery Powered Speaker System for iPod