How to install an intercom telephone system - PABX, a Practical step by step guide.

🌟NEW PRODUCT🌟 Introducing the STX Intercom by Rugged Radios with True High Fidelity Stereo, Adjustable Equlizer App, and Rear Seat Isolation Mode. Enjoy True High Fidelity Stereo Sound 🎧 on completely new platform with superior sound quality for music lovers! 🎶🎵 With a new equalizer app for Apple or Android, you can take control of your music's bass, mids and treble! Want to isolate the back seat conversation? Now you can with the STX! Set the Crew Isolation Mode so rear passengers can talk