Ultrasonic + high-frequency sound waves, double barking without hurting the dog 18-25kHz ultrasonic frequency band: beyond the range of human hearing, accurately interfering with canine auditory nerves, forcing dogs to stop barking or actively retreat. High-frequency beeping auxiliary mode: for stubborn barking or aggressive dogs, superimposed high-frequency sound waves to strengthen the deterrent effect, no physical harm, human and pet safety. 3 SECONDS QUICK RESPONSE: After pressing the button, the sound wave will be activated within 0.5 seconds and the effect will be seen within 3 seconds, no need to wait for a long time or repeat the operation. Rechargeable + portable design, all-weather guarding without worries Type-C fast charging interface: 2 hours full charge, up to 30 days of battery life or 10 hours of continuous use, no need to charge frequently for outdoor activities. Mini handheld shape: weighs only 120g, the size of a mobile phone, can be put in a pocket, backpack or hang on a key chain, carry around without cumbersome. LED power indicator: red/green dual-colour display, real-time reminder of the remaining power, to avoid the chain at critical moments. Applicable scenarios, multi-purpose security Outdoor anti-dog attack: when running, cycling, camping at night, encountering stray or aggressive dogs, a key deterrent to stay away from danger. Home anti-disturbance: neighbours barking through the wall, or your dog overreacts to the noise outside the window, a window deterrent to restore peace. Management of public places: when couriers and delivery workers enter the neighbourhood or single-family houses, prevent dogs from pouncing and biting to ensure work safety. Pet conflict mediation: In a multi-dog household, a particular dog frequently provokes or barks, quickly stopping to avoid fights and injuries.