How It Works :The cat repellent scare away unwanted animals and pests through the Passive Infrared sensor(PIR) detects motion When it detects that the moving animal is in the detection range, it automatically emits the frequency sound, flashing LED glare and drives the animals. The siren is very useful for driving animals. This can help you stay away from harassing cats, hamsters, rabbits, deer, and other stray animals.Easy To Use: you can insert the repeller into the ground, or mount against the wall, or put the top part directly on the flat surface.Battery Powered and USB Charger : Charging the ultrasonic repellent is so easy You need to just plug it in with the USB cable Or Battery AAA ,It will continue to work soon.Waterproof: The animal repeller with IP44 waterproof designed which makes it can work on the rainy day. Note: Do not soak it in water.Frequency Controls :Most animals have a wide range of listening, but only one is a more effective frequency. If the recommended settings do not work, you will need to set different frequencies to get the most out of your specific needs.