... and internet interface/port. 4,convenient and practical -the door of the cabinet is interlocking, open one key, just three ... it can save much time. the desktop, laptop, visualizer can inter-switch flexibly. The key of projector, desktop, volume and mute key can ... with one set of cabinet, one set of central controller, one set of speaker, one set of wireless microphone, one set of visualizer with 1300 ...