Hi @Walt266,
Thanks for the post, and welcome here in the Roku Community!
The LED light on the Roku Express 4K+ is an indicator that the device is turned on or off, whether it is receiving power or not. In addition, the LED light blinks when there is a command from the remote. Henceforth, the LED is built-in within the hardware to indicate its power and commands displayed on the Roku platform.
All the best,
Kash
Takashi O.
Roku Community Moderator