Halo works flawless for me on my german Shepard on the farm. It comes with instructions that has you do a lot of training, but I just put it on the dog out the box, set the warning signal, then set the emergency signal to a higher setting and the the dog figure it out in about 30 seconds and NEVER has been out of bounds. You set your fences from the app on your phone and make them as big as want or as small as you want, you could set you fences to a whole section of land or a few hundred square feet. You charge it night and it’s good for about 16 hours. Really a good product and works.
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