The auto “self-test” feature built into the BarkCollar is a valuable tool for confirming the collar’s functionality and ensuring it’s operating correctly. Whenever you turn the collar “on” or make changes to its settings, it will initiate a brief vibration and illuminate the status light. This automatic self-test serves as a reassuring confirmation that the BarkCollar is not only charged but also in good working order, providing peace of mind as you use it for training your dog.