The select button on the Nintendo 3DS.
The select button on all 'New' 3DS models, including the New Nintendo 2DS XL

The Select button is a button found on the Nintendo 3DS. It is located next to the Start and Home buttons. It is a small, rectangular button with the word "SELECT" written on it, and in most games is conceptually similar to the minus button on the Wii and Wii U controllers. In Smash 4, it acts identically to the Start button; it can pause the game and advance menus.

On the New Nintendo 3DS models, it is below the Start Button, the small, circular button under the face buttons, with Select also being a circular button, right next to the mic. However, it is not next to the mic on the New Nintendo 2DS XL, as the mic is on the hinge, similar to the DSi. The button does still have the same positioning on the New Nintendo 2DS XL.