REPLACEMENT for your existing 2 prongs intercoms that were formally marketed as"FM Wireless Intercom" by Radio Shack, GE, Novi 1990&rsquo;s to 2016 A Cost Effective REPLACEMENT for your existing 2 prongs intercoms that were formally marketed as "FM Wireless Intercom" by Radio Shack, GE, Novi 1900s to 2016 Setup is Required, Setup Steps included. Don't waste your time for a blind outlet hunt. Read the Product Knowledge -; 2nd picture in the Picture Gallery before buying 3 Channels intercoms with voice activation feature.