Ultrasonic stop barking technology, safe and efficient High-frequency ultrasonic interference: The device stimulates the dog's auditory system by transmitting high-frequency ultrasonic waves that are inaudible to human ears but sensitive to canines, so that the dog stops barking due to discomfort. Tested by authoritative organisations, it has a significant effect on canine barking inhibition and is harmless to humans and other animals.Intelligent sensor activation: Built-in high sensitivity microphone can accurately identify the barking sound and automatically trigger the ultrasonic emission, no need to manually operate, to achieve instant stop barking. Multi-scene application, flexible adjustment Three-speed sensitivity adjustment: Supporting low, medium and high sensitivity settings, users can adjust the sensing range (effective distance 4.5-15 metres) according to the environmental noise or the size of the dog to adapt to the needs of different scenarios. Outdoor waterproof design: the product reaches IP65 waterproof grade, the shell is UV resistant and not easy to fade, can be hung in trees, eaves or courtyard, suitable for long-term outdoor use. Humanised design, convenient and durable Eco-friendly material and ergonomics: Adopting environmentally friendly plastic shell, which is wear-resistant, drop-resistant and easy to clean; the top is equipped with a lanyard or hook, which is convenient to carry and fix. Visual operation and battery life: digital display shows real-time power and working status, built-in 2000mAh lithium battery, charging 3 hours can work continuously for 30 days, support Type-C fast charging. Multi-mode function, scientific training Tri-frequency ultrasonic switching: Provides three different frequency ultrasonic modes, which can be flexibly switched according to the dog's response, avoiding a single frequency leading to adaptive immunity. Sound training assistance: support manual button to trigger the warning sound, combined with ultrasound to achieve warning - stop dual training, to help the dog establish a conditioned reflex, and gradually reduce the barking behaviour.