this has already becoming ineffective for your dogs, I don't know if the battery is dying or if its just something they are ignoring but even our large dogs don't seem to notice it, and it only goes off when the manual button is hit. I really think this is still a good way to correct incessant barking. I will go buy a new battery and see if there is any change but I am indeed on the look for one that has an a/c adapter as I think that would help it be more effective.