❂ FREQUENCY CONVERT AUTOMATICALLY & WIDE COVERAGE AREA. Our cutting edge technology is not only powerful but also covers a large distance area. Effective area( 4 Packs ) total up to 5200 sq ft which you can use in any room you desire. Automatic frequency conversion makes it not easy for pests to get used to the same frequency. Ultrasonic frequencies do not travel through walls, so for the most effective pest control, ultrasonic devices need to be placed in multiple rooms. ❂ NO POISONS NO CHEMICALS. 100% safe for human and pets. No poisons, no chemicals, non-toxic. The ultrasonic technology can drive pests away without killing them. Eco-Friendly and save your effort to clean up the dead insects. It is cheaper and more durable than those expensive pest control companies and other pest control methods. ❂ EASY TO PLUG IN. Easy to use without any complex steps. Just plug in and it will work automatically. Plug to the power socket at 30cm away from the floor and should be vertical to the floor. For best use wait for 2-3 weeks before powerful results are seen and revealed. It costs less than £1.00 every year to run this device! Simple & Effective. ❂ ALL PESTS CONTROL. This ultrasonic insect repellent can effectively repel all the pests, like spiders, mice, mosquitoes, rats, cockroaches, roaches, ants, flies, bug and so on with its super-safe ultrasonic waves. Help you rebuild a clean and comfortable home. ❂ Buy Without Risk: 24 hours professional service center, LIFETIME WARRANTY and technical supported. Excellent customer service brings you no worries after purchase. Please feel free to reach us if you have any question or dissatisfaction.