? 13R-DUO : 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 ~ 125 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 3500 SQ. Feet to 4000 SQ. Feet Area. (When in an open field without any obstruction, their coverage could be doubled) ? 13R-DUO : 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. ? 13R-DUO : This Product Under Earth Innovation Brand Registry with Product Design Registered Number : 385466-001, Company Certificate : ISO 9001:2015, RoHS and CE Certified Company. ? 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.