JALL Ultrasonic Pest Repeller Plug in Pest Control - Electric Mouse Repellent Repellent for Mosquito, Mice, Rat, Roach, Spider, Flea, Ant, Fly, Bed Bugs, Cockroach - No Traps Poison & Sprayers JALL ultrasonic Pest Repellent is effective for an area up to 80 Square Meters.Since ultrasonic sound can not penetrate wall and solid object, one room one unit is recommended. As for large storage area with serious pest infestation, additional units is required. Generally speaking, 6 Packs can cover your house. Bed Bugs, Spiders Ants, Rodents Mice / Rat Mosquitoes, Fleas Cockroaches / Roaches This ultrasonic pest repellent use safe &amp; advanced effective technology to disturb and irritate the nervous system of pests, which is more powerful which make pests and rodents are harder to immunize than before. Work well on mice, cockroach, ants, spiders, bed bugs, mosquitoes, insects, rodents, flies, fleas and other kinds of pests. Inaudible Ultrasonic Frequency : 24 - 64 KHz Input Voltage : AC 90 - 250 V Output Power : 2 - 3 W Effective Coverage Area : 120 - 150 Sq. Meter. per unit Operating Temperature Range : 0 - 40 Please install our item at 80-120cm away from the floor . Just plug electronic repellent into the socket and let it do the rest. And should be vertical to the floor and plug to the outlet. Due:Please note that if you have a hamster pet at home, please Do not use this Ultrasonic Pest Repeller. The Ultrasonic Pest Repellent is effective for an area up to 120~150 Square Meters per unit. Since ultrasonic sound can not penetrate wall and solid object, one room one unit is recommended. As for large storage area with serious pest infestation, additional units is required. If you have any mentioned insect or hamster as pet, please don&#039;t use this mouse repellent nearby your pets. Normally,pests will increase at the beginning of the using days. Because they will get away from the living place after the attack of the ultrasonic.