Stv have produced a wide range of pest control systems and weatherproof baits for a wide range of unwanted guests in and around your home or work place this simple plug and go pest repeller is ideal all around the home and will give years of protection and peace of mind from rodent activity in your home the stv789 combines swept ultrasound and electromagnetic action this travels through the wiring system of your home and will target nest areas within wall and ceiling cavities and drive out roden