Unique design: Smooth appearance and lightweight design to fit easily into hands, buckle & lanyard design which makes it easy to carry during outdoor activities, matched with exclusive customized yellow color makes it looks cute and fashionable. Three uncomplicated buttons integrated with cartoon image of dog, which is novel and funny, makeing this training and anti barking device easy to use for anyone. 3-in-1 training and anti barking device: NZONPET dog gentle anti barking device provides a safe and effective solution for dog training and bark control. With an ultrasonic releasing mode, a beep training mode and a LED flash light mode, the dog barking deterrent devices can effectively train your dogs to stop unwanted behaviors like barking, digging, clawing, biting, scratching, and getting on furniture, easy peasy. Equipped with 3 different frequency sound waves: NZONPET ultrasonic dog bark deterrent can emit ultrasonic sounds with 3 different frequency sound waves, like stable frequency, undulating frequency and irregular frequency sound waves to avoid dogs getting used to a certain frequency.