Soundless to human ears, no smell, perfect for killing bats, safe for children and pets. How it Works: This ultrasonic bat repellent works on a biological level, sending bats and other unwanted guests back into nature by emitting ultrasonic waves. Enjoy living in a pest-free home: While this ultrasonic repellent is specifically designed to exterminate bats, it is also effective on mice, rats, flies, bugs, mosquitos, fleas, and cockroaches. Product specification:Applicable area: less than 20 square metersInput voltage: 100-240V/ACInput power: 2wOutput audio: 20-65KHz Size: 105mm*60mn*20mm Package Contains: 1*Mouse Repeller Note:1. Please allow slight errors due to manual measurement. Please make sure you do not mind before bidding.2. Due to different monitors, the color may vary, please understand. Note:Hello, please pay attention to your shipping address when purchasing the product. If your receiving information (eg: name, street, house number, doorbell/email with no name, etc.) is incorrect, the order will not be delivered correctly.