Instruct: Classify the given review into positive or negative sentiment.
Query: Poor watch, poor customer service

This watch's altimeter did not funtion correctly; I live on the ocean so I could calibrate it to sea level, five minutes later it would read -89 feet or something rediculous. It had to be reset all the time. Customer service was no help as they did not know how to work the functions on the watch. Wait for the bugs to be worked out beofre purchasing this item. Also, this watch was rated for 100 feet but flooded at 30 feet.