I specifically asked the seller if this product supports HDMI 2.1 and was told it did. The product is also advertised as being designed to run cables through a wall. The buttons offer too much signal loss to be used as a through-wall application. 1 button can be used in the HDMI cable, but when the second button is used, there is no signal. I have used HDMI 2.1 compatible cables less than 15 feet total length and 2 of these keystone cables.
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