The Stylus (a.k.a. Styli) is an accessory that comes with every Nintendo DS, Nintendo DS Lite, Nintendo DSi, Nintendo DSi XL, Nintendo 3DS, Nintendo 3DS XL, New Nintendo 2DS XL and Wii U (Although it is possible to purchase another stylus from a Third-Party company if the original was misplaced.)
The Stylus looks like a pen. It is located at a specific area of the DS, depending on which model. It helps players have more accuracy in using the bottom half of the console, the touch screen, as the keyboard is small or other cases.
The stylus of a 3DS looks slightly more modernized and has metal for the shaft of it, unlike the other stylus in past DS consoles. The 3DS stylus can be extended by holding the back end of it and pulling it backwards, effectively making a longer and therefore more comfortable gaming experience. (up to 100mm). The DSi XL has an improved version of stylus known as a 'Touch Pen'.
The dimensions of the stylus vary from model to model. Below is a table comparing the sizes.
Nintendo DSi XL (normal)
Nintendo DSi XL (touch pen)
|Length||75 mm (3.0 inches)||87.5 mm (3.44 inches)||92 mm (3.6 inches)||96 mm (3.8 inches)||129.3 mm (5.09 inches)|
|Width||4 mm (0.16 inches)||4.9 mm (0.19 inches)||4.9 mm (0.19 inches)||4.9 mm (0.19 inches)||10 mm (0.39 inches)|