Simple instruction mastery: adjust ultrasonic frequencies to an effective range of up to 30 meters and guide your dog through basic commands such as sitting, touching, lying down, and standing up with ease. flexibility: compact, lightweight whistle with a convenient lanyard for use anytime, anywhere. Lock nuts and caps keep the device ready whether you are at home or outdoors. Consistent control: train with precise frequency settings and observe your dog's responses. Use the strongest response as a clear signal to reinforce training and repeat until stable obedience is achieved. Effective training aid: reinforce positive behavior with the ultrasonic dog whistle. Suitable for both dogs and cats, and effective in shaping your pet's behavior. Key attributes: function ultrasonic command tool for dogs and cats; compatibility suitable for dogs and cats; size compact and lightweight; durability features lock nuts and caps for readiness; performance adjustable frequencies with up to 30 meter range and a portable lanyard for easy use. Use scenario indoors: during home training sessions to teach sit, lie down, touch, and stand up with quick iterations and clear feedback. Use scenario outdoors: during walks or outdoor practice to reinforce recall and obedience in realworld environments. Use scenario multipet households: manage both dogs and cats in a shared space, using consistent signals to guide behavior and reinforce positive actions.