Duplex wall switches

See the following discussion ( this is a clickable link) :

Note also that if you are willing to use smart lightbulbs, you have many more options. In that case, see the following list of button controllers that work with smart things.

It’s just that many of the button controllers are not load controlling themselves, so they work great with smart bulbs but if the bulbs are dumb bulbs you need to also add something to control the load, which brings us back to the previous link.