Ultrasonic repellent, efficient and safe High-frequency ultrasonic technology: utilizes high-frequency sound waves above 25,000Hz, which are inaudible to the human ear but sensitive to the dog, to interfere with the dog's auditory system and make it feel uncomfortable, so that it can actively stay away. Dual-core, dual-speed design: Provides ultrasonic modes of different strengths and frequencies, adapting to the needs of different scenarios, with more significant repelling effects. Safe and harmless: ultrasonic waves are harmless to humans and most mammals, and will not cause long-term injury or discomfort. Strong light burst flash, double deterrence High power LED light: High brightness light not only provides illumination at night, but also serves as a warning signal to enhance the repellent effect. BURST FLASH MODE: When the burst flash light is turned on, it can be used with ultrasonic waves to more effectively scare away unwanted animals. PORTABLE AND EASY TO USE, LONG LASTING LIFE COMPACT DESIGN: Compact and lightweight, easy to carry, suitable for outdoor walking, running, cycling and other scenarios. Built-in lithium battery: supports USB charging, one charge can be used for a long time to meet daily needs. Battery indicator: real-time display of the remaining battery power, to avoid being unable to use due to insufficient power.