Integrating active speakers (with some functions of the mobile teaching tool) to achieve sound pickup, amplification, line audio source amplification, strong switching of broadcasting signals (suitable for both IP broadcasting and analog broadcasting signals), teaching whips, photography, and PPT page flipping functions. One set of stereo audio input, one set of stereo line output, one wired microphone input (including power supply), and one set of power output. Set up an independent volume control knob.