Bark Deterrent Devices: 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 Dogs Dog Barking Silencer:With 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! Barks No More Dog Training Device:Use Up To 30 Feet, Wide Range, No Pain, No Harm, No Leash Just Click The Training Button And Give The Command. 100% Safe! Portability & Safety Design: Compact And Lightweight For Easy Portability, With A Built-In Safety Lock To Prevent Accidental Activation.Ultrasonic Dog Training And Deterrent Device (10k Hz – 30k 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. Attention: 1. The device is suitable for dogs aged 6 months to 8 years, except for the sick, elderly, or pregnant dogs. 2. Be aware of your dog's health condition. If your dog has a history of epilepsy or neurological problems, please avoid using the device. 3. When using the device, be sure to closely monitor your dog's behavior and emotional changes. If any abnormalities are found, it should be stopped immediately.