Spec Sheet Preview: The SC-300 counter-top ticket window intercom is designed for applications where a cutout in the barrier is impractical. How It Works... Two-way communication is accomplished through the use of speakers and microphones on each side of the partition. The inside Master unit is equipped with a 15" gooseneck microphone, power on/off switch, power-on LED, and external volume controls. The Remote unit is vandal resistant with all controls located within the metal housing.The SC-300 provides electronic two-way hands-free audio communications (duplex) between a partit …