Features: Works by continuously emitting a powerful range of ultrasonic sound waves that drives away pests. Sound wave frequencies are non-toxic and harmless to humans and pets, an alternative to toxic chemicals and dangerous traps. Coverage area up to 80 square meters if there is an open space. LED light indicates that it is currently working. Low power consumption, suitable for long time operation. Does not interfere with the operation of radio, television or other electronic equipment. Just plug in socket and press the operate button. It will automatically work. Note: This product is based on physical method, it usually takes 1-4 weeks of continuous use to show its effect: rats, mosquitoes, cockroaches, etc. will be significantly reduced. In some areas, rats and cockroaches will be more active and running around within the first 3-5 days. This is normal because ultrasonic and electromagnetic waves can cause neurological disorder to rats, mosquitoes, and cockroaches. This product has no adverse effects on the human body, please rest assured to use! Instead of killing pests, this product can only drive them crazy. Therefore, it is recommended to use other mouse traps to achieve better control results.