Recharge by Solar, USB or Battery - 1. When the solar energy is sufficient, you can charge the cat repellent through the solar panel placed on top of the device. 2. Each cat repellent contains 3 AA batteries (removable, but requires a tool to remove the screws) to charge the cat repellent. Waterproof Ultrasonic Insect Repellent - Animal repellent is waterproof (waterproof rating: IP44). This means it can withstand normal rainfall in all directions. Note: Although animal repellents are waterproof, to maximize the shelf life of the product, it is recommended to bring it indoors if it is raining heavily or the weather is very inclement. Two Ways to Repel Bugs: Ultrasonic Lights and LEDs - Depending on the frequency selected, the repellent can emit either ultrasonic waves or LED flashes that animals hate to repel animals such as cats, dogs, squirrels, deer, bears, birds and others. It is an important partner in protecting your garden. Adjustable Sensitivity and Frequency - You can adjust the sensitivity and frequency according to your needs, eg: set the frequency to mode 1 to keep away from mice and dogs, etc. Set to Mode 2 to repel animals like cats, raccoons, skunks, etc. Note: The recommended frequency is the most effective knockback frequency in most cases. ECO-FRIENDLY - The cat repeller uses ultrasonic waves and flashing LEDs to repel animals, it will not harm animals or cause environmental damage, you can place it anywhere you want, such as: gardens, orchards, farms, etc.