Rarely used this dog collar system on my last dog - he was a terribly loud GSD mix barker in cars, and the training wasn't perfect but at least worked sometimes to get him to stop.Now, current dog, pulled out and charged and used twice then someone lost this piece in the kitchen, couldn't find, was glad to find the replacement here, and voila it's charging right now. Will be using this for walks in the woods to stop him when he gets into bad places. I don't use for training, positive reward is far more effective but this tool is perfect for the woods where to stop him from going too far or getting into trouble. God send to have a tool that basically gets him to listen to the 'come here' and 'leave it' commands on hiking/walking trails.