Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don,t waste your money

This unit was used on a 7 pound poodle. Who ever designed this item did a horrible job. The collar is heavy stiff rubber and does not swivel at the connections to the unit. the result is the collar stands out away from the dogs neck and will not stay centered. The unit has three projections that are supposed to touch the dogs neck. The way it is designed one of the end contacts is always held away from neck. We clipped the hair down to the skin and the result was still a failure. My dog has worn this all day for quite a few days and never once has there been a correction. This is a piece of junk! Save your money