Very confusing

The instructions for this training collar containment system are very confusing and not easy to understand.  It doesn't seem to work that well for our dog and it takes a while to actually figure out if it's working or not. I got this to be able to let my dog out without worrying about her wondering off too far and to keep her safe but it hasn't been effective.  I just went back to only letting her play in our fenced in backyard play area because it is safe and she can't get hurt there. Not sure if it was just the collar we received or if it's a problem for others.

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