If you already have a PS4/PS3/XOne controller, I cannot recommend this thing enough.
It plugs into the USB ports of the switch, and converts the Bluetooth signal of other controllers into something the Switch interprets as the wired pro controller. This thing was awesome for playing 4-player Mario Kart without spending the cost of the console on extra controllers.
One caveat is that gyro and rumble support are a little dicey. Their website says that both should work if you install a new firmware on the receiver from their website, but so far I must be doing it wrong...
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