The Switch uses a USB Type-C and Micro SD card for memory.
Promising review: "In a world where console manufacturers are trying to get their systems to run games at 4K resolution, Nintendo once again pitches a curve-ball, and it seems to have worked for them. Instead of trying to be more powerful than the others, they instead went for making a gaming tablet that can really play console quality games on-the-go. Let me preface this review by saying that I already reviewed this product once, but decided to write another one because I reviewed it when I only had it for a few days, with the only game I had at the time being Puyo Puyo Tetris, even though The Legend of Zelda: Breath of the Wild was the hot meal ticket at the time. The system basically looks like your regular, everyday tablet, and unlike the Wii and Wii U, they did not add any glossy plastic to it, so in my opinion, it sure does look better. The screen is also a real beauty when playing in portable mode, which is my way to play. The dock is also a great addition. When you put the Switch in the dock, you can then play your games on a TV, in which the Switch itself will upscale the game to a higher resolution since it's plugged into a power source other than the battery. It also has three USB ports, one of which being USB 3.0, and the back closes up for better cable management. I would say to get a screen protector, preferably glass, since the dock may scratch your Switch screen." —R.C. Davidson
Get it from Amazon for $299 (available in two colors).