This arrived two days ago and we are pretty impressed. I initially ordered it for my Cockapoo who barks at everything and for my older dog who is a beachcomber, dead fish and dead birds her speciality. We started by putting it on the smaller dog, collar way too long but ordered another so we can shorten one and then swap collars according to dog being trained We used it on the bleep for her, the first time she barked I said no and bleeped. She stopped, looked pretty puzzled but didn’t continue with the harsh barking. Since then she has quietly barked once, again I bleeped the noise button after telling her No and today no barking. I just pick the remote up if I think she is about to bark and she doesn’t. Someone came to the door and Hallelujah no barking. Yesterday I put it on the bigger dog, I used it on vibrate when she found a dead bird, I called Leave it first with her name, she eventually dropped the bird, ran back and got a treat. Another couple of bird incidents later she was coming straight back after a quick vibrate to get a treat. This is a huge improvement as I have been seen chasing after her all over the beach to retrieve the carrion, me getting angry, her thinking it’s a huge game. So long story cut short, we will continue with it as Training aid. I have great faith in it. I think if this continues I think it’s only going to take a short while to fully sort both problems. The interchangeable collar straps is a cheaper option than two devices although that would be easier.The instructions are not the easiest to understand but I got there. It’s simple to recharge. It isn’t too heavy on either dogs neck, little one is 10 kg and bigger dog 23. The vibration strength goes from 1 to 99. I used it on 50 for the bigger dog! Mainly because she is food driven and I thought she needed more of a buzz.I will update this review after a few weeks.