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This 1 in 4 out HDMI splitter integrates a built-in signal amplification repeater chip to strengthen HDMI transmission signals and effectively resolve signal weakening caused by long connecting cables. It copies one video source and outputs identical mirror images to four display devices at the same time, suitable for shop advertising screens, meeting room presentations and home multi-screen entertainment. The splitter fully supports 4K Ultra HD resolution, 1080P high definition and 3D movie playback, presenting consistent clear pictures on all connected screens. Internal anti-interference shielding structure avoids screen flicker, color distortion and frame loss during long-hour continuous work. Plug-and-play operation requires no complicated driver installation; simply connect the signal source, power supply and displays to realize synchronous multi-screen output instantly.