Anti-bark device: At the touch of a button, the device emits ultrasonic waves that only dogs can hear. Instantly help stop bad dog behavior like barking and digging. Safe for both humans and dogs. Easy to Use: Intuitive one-button design to avoid abuse. Ultrasound can be activated by pressing a button. Hold to continue sending ultrasound. Easy to carry: The dog bark controller is ergonomically designed to fit perfectly in the palm of your hand. The Mini Dog Trainer makes it easy to take the bracelet with you wherever you go. Ultrasonic Dog Transmitter: Can be used as a great aid to stop stray or loose dogs from getting close to you or your pet. Stay away from conflict and danger.