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The Duo sends the same image two ways at once — 4K over HDMI straight to the panel at the front of the room, and USB to your laptop for the class joining online. You do not have to choose between the students in front of you and the ones at home, or unplug anything to switch. Key features 12 megapixel sensor, 4056 x 3040, with 4K at 30fps and 1080p at 60fps Simultaneous HDMI and USB-C output 25x total zoom, combining 5x digital and 5x mechanical Nine button controls on the base for focus, zoom, snapshot and recording Three-pivot arm for capturing from any angle MicroSD slot for recording without a computer A3 scan area; runs from a 5V DC adapter Why it helps in the classroom HDMI output means the Duo works with no computer at all — plug it into the panel and it just shows. That matters for relief teachers, for rooms where the laptop is unreliable, and for anyone who would rather not troubleshoot software with thirty students waiting. The physical buttons help for the same reason: freeze, zoom or snapshot without hunting through a menu. Purchase orders are welcome from schools and government institutions.