HOW IT WORKS - This Ultrasonic Squirrel Repeller works on a biological level by sending out ultrasonic waves to send squirrels and other unwanted guests back to nature. This means no dead squirrels, mice, rats, flies, or bugs for you to clean out of your house One unit covers an area of 100-800 sqft. ENJOY LIVING IN A PEST FREE HOME - While This Ultrasonic Repeller is specifically designed to eliminate Squirrels, it also works on Mice, Rats, Flies, Bugs, Mosquitoes, Fleas, and Cockroaches.WE ARE REAL PEOPLE WHO USE OUR OWN PRODUCTS every day. 1. Voltage: 100-240V AC, 50/60HZ2. Power: 2.5w3. Output Audio: 20-65KHz Coverage 100 to 800 square feet, no obstacles in front of the device that may obstruct the ultrasonic waves.