Ultrasonic and ElectroMagnetic Technology : Neatmaster bug repellent uses state of the art Ultrasonic and ElectroMagnetic technology to drive pests away , which drive pests out of your home for good. Mice, rats, spiders, roaches, mosquitoes, ants ,snakes , rats; None are immune to the sound and completely leave after a few short weeks of use.Our insect repellent sound is In-Audible to the human and pet's ear .SAFE, ECO-FRIENDLY AND ECONOMICAL : Throw away the harmful poisons, dangerous chemicals, and traps typically used in households and by insect control technicians. Our mice repellent is 100% safe and effective. Naturally drives pests out without killing them. No need to clean up dead insects and pests. Our ultrasonic pest repellent creates an unbearable environment for pests so they simply leave.UNBELIEVABLE COVERAGE AREA : Neatmaster pest control products is effective for an area up to 800~1200 Square Feet. Please note that ultrasonic waves can't travel through walls and solid stuff .EASY TO OPERATE : Simply plug our electronic Indoor Rodent Control in the unit , It works when you notice the green light is on , which is used for minor pest infestation ; Adjust to Purple light mode when you have middle pest infestation , Turning on Red mode when you have terrible pests infestationLIFETIME GUARANTEE ASSURANCE- Our Ultrasonic spider repellent is backed by our Lifetime guarantee because we want to help you get rid of those pests and we offer a money back guarantee if you don't see results within 3 weeks. Typical results can take 2-3 weeks depending on the amount of infestation.