This set includes everything you need to play wirelessly on your NES Mini Classic: The 8bitdo NES30 controller as well as the NES Classic Retro Receiver.
You can also use two sets for two-player games. It's also possible to use any other 8bitdo Controller you own.
Additionally, the NES Mini Classic Retro Receiver can also be plugged into your PC (via USB) so you can use the wireless controller there as well.
The perfect set to play games wirelessly on your NES Mini Classic!