This product combines training function and deterrent function in one, replacing dog whistle. Bark Collar, Training Collar, Dog Barking Silencer.Dog Training Clicker，Bark Buster，Anti Barking Device for DogsWith 3 Modes, Deterrent Flash, Training, Sound Mode, Ultrasonic 21khz-32khz, Can Meet The Training And Deterrent Dog Bad Habits, Bark.Bite.Fight. Provide Good Training For Dogs!Use Up To 50 Feet, Wide Range, No Pain, No Harm, No Leash Just Click The Training Button And Give The Command. 100% Safe!Compact And Lightweight For Easy Portability, With A Built-In Safety Lock To Prevent Accidental Activation. It Also Features A 10-Second Auto-Off Function For Enhanced Safety And Energy Efficiency During UseUltrasonic Dog Training And Deterrent Device (21k Hz – 32k Hz) Effectively Captures Your Dog’S Attention, Corrects Unwanted Behaviors, And Helps Deter Nuisance Barking From Neighboring Dogs, All With Inaudible Sound Waves That Are Safe, Humane, And Non-Stressful.