JWP-series are the only professional ultrasonic pest repellers with special â Multiplex Modulated Sweeping Ultrasonic Soundsâ . It combines our 2 unique technologies â Automatic Frequency Changeâ and â Adjustable Sweeping Speedâ which can prevent rodents from getting used to the single-frequency sound by changing frequency and speed all the time. These intense ultrasonic waves ( 20~ 65 kHz are out of the hearing range of humans) directly attack rodentsâ auditory and central nerve systems to drive away these unwanted animals from your place without the use of toxic chemicals or killing them. Our products guarantee quality performance and lasting effectiveness and are made in Taiwan. Coverage ranges from 100 sq. meters to 600 sq. meters. ( When in an open field without any obstruction, their coverage could be doubled) Household Model: JWP-307 Effective Coverage: 100 sq. m Business Model: JWP-309 Effective Coverage: 165 sq. m Factory Model: JWP-313 Effective Coverage: 230 sq. m Industrial Model: JWP-315 Effective Coverage: 330 sq. m Warehouse Model: JWP-316 Effective Coverage: 500 sq. m Professional Model: JWP-318 Effective Coverage: 660 sq. m