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What is HDMI CEC? All You Need to Know about HDMI CEC
Amazon.com: Ensigear HDMI CEC Blocker hdmi cec Interceptor. The CEC Function can be manually Turned on or Off (pin 13) for Devices Connected to HDMI Cables Through The CEC Adapter.【2pcs】 : Electronics
Understanding HDMI-CEC frame : Tiny Electron's Blog