Ultrasonic anti dog barking trainer LED light gentle chaser pet gentle sonics

"This is a great product! I have two dogs and they were very aggressive with my mail person, and when this arrived and the mailman showed up, they went into their usual actions, and I simply pushed the button and they instantly stop. only used it one more time after that and they have completely changed how they act. The mailman asked if it was a shocking collar...and was amazed when I told him NO, it omits a sound that we humans cannot hear with a laser beam and that it. Also, amazed at the price!!! I've given three people the link so far and am sure more will ask for it."