Dog Barking Control Devices, Ultrasonic Dog Barking Deterrent Devices w 3 Frequencies Immune Proof, USB Rechargeable Handheld Dog Training Tool Barking Behavior Hat Sun Protection these Christmas bows are designed these Christmas bows are designed to last Creating richness: The Hanging Feeder can provide with an opportunity to explore and entertain ·Rechargeable long battery life Human beep fucntion for conditioned reflex this dog barking deterrent devices has a beep function button you can press the beep button before every ultrasonic emission both beep and ultrasonic will help them understand that their bad behaviors will cause uncomfortable experience and at last your dog will establish a conditioned reflex to the beeping sound and you can stop their bad behavior just by beep function without ultrasonic punishment