We've already reported that the Switch's Pro Controller can connect to your PC. As it turns out, it's not the only device for the new Nintendo console that can be used across multiple platforms.
The hybrid two-part Joy-Cons that come with the Switch can also be connected to other devices via Bluetooth. The expected downside is that you won't have access to all the features available when they're linked to the Switch, but they will be usable in more traditional sense.
And this applies to Windows and Android devices (as already confirmed by Nintendo) but also to Macs, according to Sam Williams, who recently discovered this unexpected and yet welcomed compatibility. Here's a demonstration by DreWoof on YouTube.
It should be noted that compatibility isn't possible with all iOS platforms.