Zenith Space Command

In 1956, the first widely used TV remote control had four buttons (power, volume, channel up, channel down) but no batteries. Press a button, and a tiny hammer inside the remote would strike an aluminum rod, transmitting an ultrahigh-frequency tone to control the set. They were affectionately known as clickers, because they actually clicked when you pressed the buttons.

Pictured remote outside and inside. Back then they only had a few channels to scroll through, and all TVs were black and white, so it was not a big deal.

I read that you could sometimes drop a coin on it and it would change channels. The Space Command lasted more than 25 years before being replaced by remotes using infrared technology. Before these slick devices, they actually had a remote that was physically wired directly to the TV. . . and before that they had kids that they would tell to go change the channel, or turn up the volume.