SPLITMUX-HD-2RSLC - Low-Cost 2 to 1 HDMI Dual Screen Splitter/Multiviewer with IR & RS232
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OREI HDMI Splitter 1 in 2 Out 4K - 1x2 HDMI Display Duplicate/Mirror - Powered Splitter Full HD 1080P, 4K @ 30Hz (One Input To Two Outputs) - USB Cable Included - 1 Source to 2 Identical Displays : Electronics
Amazon.com: avedio links HDMI Splitter 1 in 2 Out, 4K HDMI Splitter for Dual Monitors Duplicate/Mirror Only, 1x2 HDMI Splitter 1 to 2 Amplifier for Full HD 1080P 3D with HDMI Cable (