Dog Training Collar 800M Remote Transmitter for M880-1/M880-2/M880-3

What a remarkable difference this has made. We have two rescue dogs, therefore they were not raised on our property. We installed this system and trained our boys that the flags indicate their boundaries. I had to modify collars for my dogs (very easy with a leather punch) as the collar that came with it is for a medium dog.Peace of mind knowing that they can run and play - but stay in my yard.