Some clever people have figured out that you can easily use Nintendo Switch Joy-Con Controllers on PC, Mac as well as Android devices.
Similar to the PlayStation 4 Dualshock controller, you can use the in-built Joy-Con bluetooth to connect to your bluetooth in your PC, Mac or Android device in order to play games. Unfortunately, they won’t work with iPhone or iPad as iOS devices as they used a custom controller specification.
When using the Joy-Cons with a Mac, which you can easily add in Bluetooth settings, each Joy-Con will recognise as a seperate controller. You can’t yet use them together to form one controller.