1.Supports SD card maximum capacity to 2Gb, and suggests using low-speed SD card. If it's not recognized, it may be larger than 2Gb or SDHC "high speed", please use the correct type of SD card and we highly recommande you use original sd card.2. Keep your SD card formatted as FAT (FAT16) format, or the card will not be recognized.3. Always charge after playing, or may cause damage to the card.4. Do not play the game or switched dial SD card, it may cause damage to the SD card. 5.Do not touch the FOR GBA microswitch when you plug in the Card. Works with G B A Player for Gameboy. It will show the menu on the screen, you just need to make sure you have a good brand micro SD card (PNY works well). It supports FOR GB, GBA, and NES (not just GBA files). Except for GBA, It works through emulation.NOTE: Designed for Windows, but will work on MAC OSX & Linux1. FOR GBA & DS files must first be converted for use in the Supercard.Download conversion software "SC MiniSD v2.71": NOTE: Make sure you tell Windows to run the software as WinXP SP2.2. Organize your files into folders with a max number of 65 in each folder. The card only recognizes the first 65 per folder, but you can have as many folders as you like, at least until you run out of space.3. When using FOR GBA files: L + R + B + SELECT brings up REALTIME SAVE menu L + R + A + SELECT brings up SC NORMAL SAVE menu L + R + START + SELECT resets to the main menu4. In order to keep your FOR GBA game saves you must reset to the MAIN menu, scroll right to the SAVE menu, locate the game file you want to save, press A to bring up SAVE prompt, and select "YES" to save to SD.5. Game files for non-GBA games will not save properly without a .SAV file of the same name as the game. Simply rename a .SAV file (64k size) and include it in the same folder as the game file. Example: place gamename.sav in the same folder as gamename.rom file.