Tripp Lite B127M-101-H Owner's Manual page 6

Disclaimer
Before installation, please check the following settings of your
source(s) and TV/monitor(s):
1. Set display to 60 Hz. Double-check factory settings, as
default can be set to a lower frequency (Hz) than advertised.
2. Ensure the input setting of your monitor is set at HDMI 2.0.
Some displays may have default setting at HDMI 1.4.
3. Verify your monitor has the HDR feature enabled. Some
displays may have this feature disabled as a factory setting.
4. Check if the Ultra HD (UHD) Deep Color setting is enabled on
your TV/monitor. Confirm with your TV/monitor manufacturer
which HDMI ports support UHD Deep Color.
Note: To connect a local monitor to the transmitter in your installation,
the UHD Deep Color setting may need to be disabled on your local TV/
monitor (depending make/mode) to achieve 4K @ 60 Hz resolution.
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