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They're just lights controlled over WiFi by either HTTP or TCP.
You've got multiple options to control them, you can use any of the options or build your own:
- Android app
- iPhone app
- Windows systray app
- Mac systray app
- Stream Deck to Windows or Mac
- PowerShell https://trevorsullivan.net/2020/08/17/automate-the-elgato-key-light-air-with-powershell/ (hell, build your own app in any language if you want, the network requests are outlined in this post)
- Linux utils such as https://github.com/justinforlenza/keylight-control
- Use Home Assistant or an equivalent to map any other button or control you posses into a light switch, i.e. use a Philips Hue light switch via Home Assistant to control the Elgato lights
They come with support for 99% of desktops, laptops and phones, with an optional set of fully customisable buttons to do things, and then various OSS solutions for the final 1%.
Feel free not to buy them if you think them excessive, large, too bright, too dim, ugly, that you dislike that they're not powered by USB-C or whatever... but lack of control options is odd when there's so many options the problem is which one to choose - I couldn't choose and ended up mixing and matching lots of options.
- Android app
It runs on your phone.
I wasn't betting on either the app or stream deck when I bought them