HOW IT WORKS - This ultrasonic bat repeller works on a biological level by sending ultrasonic waves to drive bats and other unwanted guests back into the wild. This means there are no dead bats, mice, rats, flies or insects to clean from your homeOne unit covers an area of 100 to 800 feet squares.ENJOY LIFE IN A PEST-FREE HOME - Although this ultrasonic repeller is specifically designed to kill bats, it also works on mice, rats, flies, insects, mosquitoes, fleas and cockroaches. PRODUCTS every day. We expect the best for our family and want the same for yours. Click the ADD TO CART NOW button and grab this offer before our limited time offer expiresProduct Specifications1. voltage: 100-240 V AC, 50/60 HZ2. Power: 2.5 W3. Output audio: 20-65KHzPlug-in electrical appliance: no outdoor, hot water, water or other liquids or humid environment.100 coverage at 800 square feet, no obstacles in front of the device that can obstruct the ultrasonic waves.