2018 Upgraded Ultrasonic Pest Repeller Electronic Mice Repellent Pest Reject Plug in Indoor Human& Easy to Get Rid of Bug,Rat,Mosquito,Roach,Ant,Fly,Spider, Rodent-No Trap,Sprayer&Baits UPGRADED SMART CHIP AND LATEST ULTRASONIC TECH: The ultrasonic pest repeller is equipped with the most advanced chip to enhance the ultrasound, and it constantly auto-varies frequency between 22-65 KHz to attack the nervous system of pests and makes them never become immune to the sound. The pest repellents rear speaker makes the ultrasound can go through walls effectively to drive cockroach, ants, mouse, rats, bugs and all species of pests out of the walls of your home. SAFE, SAVING AND HUMANE: The electronic mouse repellent emits ultrasonic sound to repel mouse and other pests away from your house rather than killing them by using trap or toxic, which is safe for your family and pets. One rodent repellent can last for a couple of years, saving you hundreds of dollars in paying for exterminating pest control service. WIDE APPLICATION &WIDE COVERAGE RANGE: An ultrasonic pest repeller with an approximate coverage area of 1200 sq.ft. One unit for each room is recommended, so every corner of the house can be completely covered and protected. The ultrasonic bug repellent can be widely used in other places such as office, warehouse, garage, hotel, supermarket, and restaurant EASY TO USE: Simply plug the mice repellent into the electrical outlet, then the electronic pest repellent will emit non-repetitive frequency ultrasound to attack the auditory and nervous systems of these pests, causing them discomfort and forcing them out for good. Please install the pest repeller near the areas where the rat or pests might visit. 10-30 inches above from the ground is recommended for crawling pest, while higher for flying pest. 60-DAYS MONEY BACK GUARRANTEE: We are so confident in our products and services, that we back them with a full 60 day money back guarantee. If you are not satisfied with our ultrasonic pest repeller, and it does not get rid of your problem after 3-4 week using, we will gladly refund your money.