Wired Controller, plugs into the dock. 8 foot cable ~243cm. No features to speak of. Has pretty good reviews, probably in part because it's pretty cheap normally. I got it for games where I'm pretty hard on the joystick so I'm not too upset when it breaks.
I watched a review where they used an adapter to plug it straight into the switch and it worked, so that may be another option, but no guarantees.
I'm kind of expecting the price to go up any minute, but we'll see what happens.