Also, as two collars may be controlled with one remote, it enables individual vibration and shock configurations for each collar. This lessens any probabilities of error. Ultrasonic bark collars emit a significant-pitched audio that only dogs can hear when barking is sensed. They're another more humane alternative to static bark https://trevoryhpyh.isblog.net/smart-shock-bark-training-collar-secrets-53263390