?Nintendo DS cards allow the end user to play regular games on your Nintendo DS or DSi. However, they also enable the use of the console as an MP3 player or even a movie player. Many newer generation cartridges also support reading eBooks and PDFs on the go - the Acekard 2i belongs to the latter category. The Acekard 2i was released in 2009 but is constantly updated. It is one of the few genuine / original DS cards currently existing in the market that has its firmware updated quite frequently. There are two versions of the firmware; the official firwmare released by the Acekard team and the unofficial firmware known as AKAIO which is accepted by the Nintendo DS Homebrew community. From internal tests, NDS-Gear believes that the AKAIO firmware is far superior to the original firmware and allows the card to load significantly faster as well. The unofficial firmware is also updated extremely frequently, which is a testament to the dedication of their development team. A feature unique to the Acekard 2i at the time of its release is the use of internal NAND memory. This is basically memory inside the DS card itself which acts as RAM for when a user is playing games or loading applications. It does not completely rely on free space inside the Micro-SD card to shuffle files around and store data temporarily. For this reason, it makes the loading process and general usage of the card incredibly quick and rather reliable. The manufacturing process and the dimensional controls of the Acekard 2i are pretty decent, although not as perfect as some of the best cards on the market. It is certainly nothing that a human would be able to discern with the naked eye. Occasionally, an Acekard 2i is slightly larger in depth and may have difficulty fitting into a Nintendo DS Lite console, for example, but should have no problems with a DSi. Even so, this problem only appears to be an issue with less than 1% of cards, and if your Acekard is bought from a reputable retailer such as NDS-Gear who tests all their cards beforehand, it is not an issue at all. It's worth noting that the Acekard 2i is backwards compatible with the regular Nintendo DS as well as the Nintendo DS Lite. It is, however, made to be compatible with Nintendo's newer consoles, the Nintendo DSi and DSi XL. The Acekard2i uses a spring mechanism to load the Micro-SD card slot which is occasionally frowned upon by the community as being less reliable than a standard push slot. About 2-3% of Acekard 2i's will have a small problem with the spring but purchasing the card from any reliable retailer such as NDS-Gear who tests all their cards beforehand, should alleviate any anxiety someone may have about making a purchase. Overall, the build quality of the Acekard 2i is good, and has an exceptional development team behind it, making it one of the biggest selling Nintendo DSi cards to date. You can Buy Acekard 2i cards from the NDS-Gear website. NDS-Gear are based in the UK and ship worldwide. They also test every single card before dispatch - their Acekard 2i service is second to none.