works silently for the human ear, does not smell, perfectly eliminates bats and 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. <br>This means no dead bats, mice, rats, flies, or bugs for you to clean out of your houseMore than 80 square meters (open space)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 <br>1.Voltage: 90-250V AC, 50/60HZ <br>2.Power: <br>2.5w <br>3.Output Audio: 20-65KHzElectrical plug-in device: no outdoors, hot, water or other liquids or humid environment.Dimensions: 97x60x58mmPacking Quantity: 1color: WhiteStyle: European regulations Our products are made with the splendid quality materials and are designed to provide you with the best possible user experience.