【How it works】 The repeller scares away unwanted animals and pests with the passive infrared sensor (PIR), detects movement and activates the ultrasonic speaker, which emits a mixture of ultrasound, sound and powerful flashing LEDs. The irregular and variable frequency is more effective in keeping away the most aggressive animals that can adapt and become immune to a certain frequency band. 【Long range】 The PIR infrared motion detector has an angle of up to 120 degrees and a detection range of up to 10 meters. This activates the cat repellent device and emits a high-frequency tone that is irritating to the cat and almost inaudible to humans. 【User safety and humane design】 Cat repellents just need to keep animals away, no chemicals. 13.5kHz-40kHz ultrasound is sent out to drive them away. It does not harm the human body. And it will not harm your cats, dogs or other animals. 【Dual USB and Solar Charging】 The ultrasonic scarecrow scares cats with 4 built-in AA batteries that are