The Lutron Caséta Wireless Lighting Starter Kit costs $230 (£150 or AU$295).
It comes with two plug-in dimmers.
And two remotes.
These products communicate with the Lutron Smart Bridge.
The Smart Bridge is compatible with Apple's HomeKit smart home software.
The Smart Bridge plugs into your router.
It works with the Apple Watch.
You can also use Siri to control Lutron lights on the watch...sort of.
You'll have to use the Handoff feature for it to work.