This easy-to-use slider controls the volume. Decide how loud or how quiet you want your game to be, it even works when you have headphones plugged into the Nintendo 3DS.
Every Nintendo 3DS comes with a 2GB or 4GB SD Card installed. Your 3D photos, downloaded games and music are saved on to the card, making it easy to transfer to and from your PC. Is that not enough space for you? You can easily swap it out with an SD Card up to 32GB large.