Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Totally worthless

This product keeps changing home addresses; none of which are the address I typed in the initial field. It does not stay charged so that it is actually able to function as advertised if you are gone from home any length of time and you put your dog in a yard. Additionally, gravity takes it down to the lower neck area in common use so that when the dog is doing normal dog things, the device sinks downward so that the antenna is pointing toward the ground. The pictures are misleading. We tried all of the advise the company gave us. It's just not a device that works when and where you need it to work. It was a lot to invest to have this many problems.