So far so good good response. Not at all harmful.

All as the picture! Dogs realized what was happening, stopped barking, when a collar on IT, this is a great tool to train dogs.but remember, start the lowest level 1 and let your dog know the vibration is from you.

Working in our lab who was confused at first when I used vibrate, after a few times he realised it was me giving him a message to stop barking and trying to get at other dogs whilst out for a walk. After showing him and looking him in the eyes when pressing the button he now gets the message to calm down.

Great product works well with training our dog

I have used this for several weeks now and found it to be very successful.

Overnight change in my dogs recall, money well spent.