WHILE OTHER BAT REPELLENTS are not pet friendly, don't really work and smell bad, the product works silently for the human ear, does not smell, perfectly eliminates bats and 100% safe for children and pets. HOW IT WORKS - This Ultrasonic Bat Repellent works on a biological level by sending out ultrasonic waves to send bats and other unwanted guests back to nature. This means no dead bats, 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 Repellent is specifically designed to eliminate Bats, it also works on Mice, Rats, Flies, Bugs, Mosquitoes, Fleas, and Cockroaches.Product Specifications 1. Voltage: 110-220V AC, 50/60HZ 2. Power: 2.5w 3. Output Audio: 20-65KHz Electrical plug-in device: no outdoors, hot, water or other liquids or humid environment.