Spa-Kem 267 Spa Brominating Tablets Pool and Spa Chemicals, 1-1/2 Pounds HOW DOES IT WORK? Eastoan Ultrasonic Pest Repeller plug in uses state of the art ultrasonic technology to drive pests away. The ultrasonic 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. Outdoor pests and insects will no longer come back. DOES IT DO HARM TO HUMAN OR PETS? Eastoan bug repellent is environment-friendly. No harmful chemicals or poisons. No need to clean up dead pests because our Ultrasonic Pest Repeller wont leave nasty dead insects or rats behind for you to deal with. The ultrasonic frequency that sent out from this machine is inaudible to human beings and pets. Safe for children, family and pets. DOES IT HAVE LIFETIME GUARANTEE? - Package includes 6 packs Plug-in Ultrasonic Pest Repellents. We offer a Lifetime warranty and typical results can take 3-4 weeks depending on the severity of the pests infestation. None of pests are immune to the sound after a few weeks of use. However, if you have a hamster pet at home, do not plug this electrical Pest Repeller in their living rooms.. IS IT EASY TO USE? Simply plug the mouse repellent into a regular power socket and the sound waves will repel the pests. The Pest Repeller is effective for an area up to 800~1200 square feet. Use 1 unit per average-sized room with a pest problem. Additional units will be required in larger areas. Areas such as attics, basements, garages and large storage areas may require more than one unit. DOES IT NEED EXPENSIVE SOLUTION? Definitely not, no more spending hundreds or even thousands of dollars of costly pest control services. Simply plug the unit into the wall and that's it! Your home will be free of all insects and rats for 3-4 weeks Pest Control Treatments.