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This active 1×4 HDMI splitter adopts HDMI 1.4b protocol and comes with a matched AC power adapter to supply stable power for signal amplification, solving weak signal problems of passive splitters under multi-screen load. It only realizes screen mirroring/duplication, outputting the same picture to four display devices at once, not supporting extended display mode. The device supports up to 4K@30Hz ultra-high definition resolution, as well as 1080P and 3D video formats to meet daily media playback and commercial display demands. High-performance signal processing chip ensures consistent picture color and synchronized audio on all four outputs, while internal anti-interference structure resists electromagnetic disturbance from surrounding equipment. Compact desktop-friendly casing with indicator lights for working status monitoring. Plug-and-play without driver installation, widely applied in meeting room presentations, store advertising screens, classroom teaching and home multi-screen viewing scenarios.