The Atlona AT-OME-CS31-SA is an AV presentation and collaboration system for classrooms and conference rooms. It features one balanced stereo audio input and two unbalanced stereo audio inputs with independent level control for each. A balanced stereo line level output allows the mixed signal to be passed to an assistive listening system or separate amplifier. The OME-CS31-SA includes USB 3.0 interfaces for two host computers, plus four peripheral devices such as a camera, speakerphone, interactive display, keyboard, mouse, or storage device.