Invisible Fence Inc. (commonly referred to as Invisible Fence) is a company that designs pet fence solutions for cats and dogs. Manufactured and distributed by Radio System Corps, the company sells wireless and fenceless systems that revolutionized pet containment when it was first introduced in 1973. Its best known product consists of an underground wire installed by an Invisible Fence employee or franchisee around the perimeter of an area, a collar with an integrated transmitter that provides a signal to the pet when it approaches the perimeter, training provided by Invisible Fence and additional training instructions for the pet owner.