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This active 1×4 HDMI splitter comes with a dedicated power cord to provide stable power supply and boost transmission signal strength, solving weak signal defects of passive splitters under multi-screen load. It only supports screen mirroring duplication instead of extended display mode, outputting the same picture to four display devices synchronously. It supports up to 4K@30Hz high-definition resolution, as well as 1080P and 3D video formats to meet daily entertainment and commercial display demands. Built-in multi-layer shielding structure effectively resists external electromagnetic interference to prevent screen flicker, color distortion and audio desync on all four output screens. The compact desktop housing has clear indicator lights to show working status. Plug-and-play without complicated driver installation, widely applied in store advertising screens, classroom teaching demonstrations, meeting room presentations and home multi-screen entertainment scenarios.