We have wild deer that run past our property at night and it was setting our dog off into hour long barking fits. We were getting threats from our neighbour. We tried keeping the dogs on the deck, running them frequently, leaving them with frozen kongs, etc. We purchased the BP-504 for our dog, and he learnt very quickly. He knows what the beep means, and we haven't had problems since. It was really useful that there was an online chat, email contact and a phone number to call making it really easy to get in touch with staff. I had a long talk on the phone when deciding on the product, then used the chat for follow up questions. Thank you!