Upgraded Frequency Conversion Technology - Our ultrasonic pest repeller features a dual-wave technology that simulates and interferes with the auditory and nerve system of pests, making it extremely irritating to them. The variable frequency waves prevent pests from developing immunity and adaptability. Easy to Use -Simply plug the ultrasonic repellents into a wall socket 6~47 inches above the floor. No tools required. Wider Coverage & Suitable for Different Places - Our ultrasonic pest repeller can cover an area of up to 1700 square feet. It is suitable for use in homes, offices, hotels, warehouses, restaurants, cafes, BBQ places, backyards, and apartments. For optimal results, we recommend installing one device per room. Eco-friendly Pest Repellent - Our ultrasonic pest repellent uses a physical method to drive pests away, without the need for poison, traps, killing, or noise. The sound emitted is not detected by the human ear and is harmless to humans, children, and pets. Multiple-object Applications - Our ultrasonic pest repellent is highly effective against various pests, including mice, rats, ants, bugs, roaches, mosquitoes, and more. With this device, you can repel pests without the need for additional traps or poisons.