I bought this wireless fence system to contain my 1 year old puppy. With a leash she jerks my arm off because she so strong and without a leash she completely runs off and will not come back when I call her name. This fence is a life saver. I plugged it in and set up the perimeter on it where I allow her to go. Programming it to my area was easy and hassle free. I placed the collar on my dog to see how it worked and its been 4 days now and she hasn't ran off any and is learning her area.So good