I researched and decided to buy the A+ trainer to train my pomeranian puppy (9mos) to stop barking constantly. Once received, the unit was easy to charge & program. I purchased this device because of the control ability- I did not want to use a shock collar. I was able to program beep and vibrate only. Within 3 days of wearing the A+ unit she barks 95% less. When she barks it's a single bark or two vs the repeated 5-10 minutes of barking.