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Pro Improved glasses-free 3D
The New 3DS has an improvement over the regular 3DS model when it comes to the 3D, there is now an infrared sensor that allows for eye tracking, which keeps the 3D focused, even when the device moves. The older model had trouble with the 3D focusing when moving the device around, that is now fixed for the most part.
Pro Has built-in NFC
This means Amiibo and Amiibo card support for scanning in figures and cards with a tap to then use as addons in certain games. Previous models did not have this function.
Pro Has microSD support
Users can use their own micro SD cards for expanded storage with support for up to 32GB cards (though there are users using 64GB or 128GB cards).
Pro Customize look with interchangeable faceplates
The New Nntendo 3DS (not the XL) is the only 3DS with support for interchangeable faceplates. This allows one to purchase new plates to customize the look of their device to their liking.
Con No charger included
In order to keep the price down on the unit Nintendo has chosen to not include a charger with the device, meaning that if you do not have one already or purchase one you will not be able to use the device past the half charge that it has out of the box.
Con Low resolution screen
Technically the resolution of the main screen is 800 x 240, but each eye gets half that making it functionally 400 x 240. A 1080p screen has more than 10 times the pixels.
Con Only available a white themed bundles in the US
So far the only model available in the US is the white one and it can only be purchased as an Animal Crossing Happy Home Designer bundle or the Pokémon 20th Anniversary Bundle. This raises the price of the unit as each bundle comes with a game.
Con Poor battery life
The battery life is not really improved over the previous models and will last between 3.5-6 hours, which is not really that long for a handheld.