Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great, but only until it broke down

This collar worked well for the first couple weeks. The spray did a wonderfull job of cutting off my pit bulls' barking escalation in the mornings as my roomates left for work. But the collar died within two weeks. It was fully charged with spray and I put in a new battery but nothing happens anymore. I expected more for my money than a lousy two weeks. Would not purchase again.