Morley Hum Exterminator Ground Loop Hum ExterminatorThe Hum Exterminator filters out unwanted voltage on the ground line that can cause ground loop hum. Simply place the Hum Exterminator on the end of the power cord of the equipment that has a Ground Loop and plug the Hum Exterminator into the wall outlet. Ground Loop is gone and signal remains intact. Easy to use, easy to install, absolutely safe and completely effective! Box Contains Morley Hum Exterminator Ground Loop Hum Exterminator 1 Year Warranty