Tripp Lite B127U-111-PHPH Owner's Manual page 10

Installation
8. Turn on the power to the HDMI source. The LEDs on the
transmitter and receiver units should begin to flash to
indicate video is being transmitted and the video should
now display on the connected monitor(s).
Note: If a daisy-chain installation is desired, repeat steps 4-7 with
up to 3 additional B127U-110-PH or B127U-110-PD units (sold
separately).
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