Does the job in fine fashion with one little hitch.
The unit works fine and as designed, that is not the issue. There are two things that will frustrate a new owner of the product. First is the cost of the batteries to keep the unit functioning. However, there is an easy fix if you are at all handy and the cost falls dramatically. Second is if you have a rough house dog or more than one dog and they play hard you will find yourself hunting down the pieces parts of your collar, a lot. The collar design makes changing the battery an easy chore. That same ease of access is why you will chase the parts down as a tooth or toenail hooking the case pops it right apart. Again this is an easy fix if you are handy with good electrical tape.
Overall I am more than pleased with the door that this collar operates and the collar(s) I have. Having three dogs it is a real convenience to have.
I would have gladly given a 5 star rating save the two issues mentioned. Both I have solved but to those who are not handy they will be an issue so no 5.
Verified purchase: YesCondition: New