The very first remote control, called “Lazy Bones,” was developed in 1950 by Zenith , I could only find an advert.
But Pasta and Vinegar managed to dig up a picture of one of the first remote control, designed by Dumont (Dumont Model RA 369 Remote Selector).
It allowed the user to select between 2 to 13 channels, modify the brightness/volume and switch on/off. But it was linked to the TV set by a cable.
“Photo courtesy of Jim Martin, Machesney Park, Illinois USA”
For a quick history of the Remote Control.