Specification: Repels Bugs, Ants, Mice, Cockroaches, Mosquitoes, Spiders, Rats, and More Non-toxic& Environment-friendly Standard Wall Plug-In Ultrasonic Frequency:20~55KHZ Power Source: AC90~220V Power: 5-6W Color: White Material: ABS Plug Type: US Plug/EU Plug/UK plug Power Supply: AC 90V-250V, 50-60Hz Ultrasonic Frequency: 22-65KHz Effective Range: 80-120 Square Meters Working Temperature: 0-40C Features: 100% brand new and high-quality made. This ultrasonic repeller can act upon the hearing and the nervous system of the mice, rats and insects to make them unpleasant and uncomfortable and forces them to leave your home. It is effective for an area up to 100~150 Square Meters. This product is widely used in homes, warehouses, shops, hotels, hospitals, offices, rooms, gardens, hotels, etc. The ultrasonic frequency that sent out from this machine is inaudible to human beings and pets. It is absolutely safe for children, family and pets. All you have to do is plug it in and it will start working. Note: This machine should be installed 20~30cm centimeter away from the floor and should be vertical to the floor and plug to the outlet. The installing point should be avoided to be in the back of the curtain, fridge, and any other furniture that deterring or attaching frequency. Within 1 meter shall not have a large obstacle that is not installed in the refrigerator, wardrobe, sofa and other objects on the back. It's normal that the mouse and vermin will increase at the beginning of the using days because they are getting away from the living place after the attack of the ultrasonic. Usually, it could take 3~4 weeks to notice results. To increase the effect, you should use the several devices at the warehouse or several rooms.