? This Ultra Sonic Pest Repeller Device is safer than traditional rat repellents. ?? Repels such pests as : rodent, rat, mice, squirrel and other pests from your property. It combines two unique technologies, “Automatic Frequency Change” and “Adjustable Sweeping Speed” which can prevent rodents from getting used to a single-frequency sound by changing frequency and speed all the time. ??These intense ultrasonic waves ( Frequency range : 20 ~ 65 kHz ) directly attack the auditory and central nervous system of rodents to drive these unwanted animals out of the home without the use of toxic chemicals. ?? Effective coverage ranges from 1200 SQ. Feet to 1500 SQ. Feet Area. (When in an open field without any obstruction, their coverage could be doubled). ? This Device is hygienic, safe, reliable, does not contain chemicals, does not pollute the environment and has no side effects on humans and environment friendly alternative to dangerous poisons and Sprayers, chemicals and traps, no bad smell and Corpses. ? F1-EI86HC : This Device Is Very Easy to Install, First Insert the Plug of the Device Into the Electrical Board, Then Turn on the Switch. And Set the Frequency and Volume According to the Guide That Came With the Machine. Because You Can Just Plug and Play This Device. ? ADVANTAGE ?? This machine is effective against rats, mice and squirrels. ?? Rats can be repelled without the use of any harmful chemicals. ?? This machine does not kill rats and you can get rid of them without killing them. ?? Insects are environmentally friendly and a part of the environment. ?? This machine is small in size and light in weight so it can be easily installed anywhere. ?? This machine has a power saving mode that consumes very little electricity. ?? Keep the environment clean and safe. ?? Not harmful to humans either. ?? The device does not affect household pets such as dogs, cats or fish. ?? is Not harmful to humans, pregnant woman and Children’s.