This is a re-programmable custom flash cartridge compatible with GBA/DS/Analogue Pocket systems. Specs: 32MiB Rom storage 1M FRAM (Forever Save) Real Time Clock (RTC) Battery Type CR1616 Check here to determine if your rom is compatible with this flash cart. Check the rom size and save type. Games equal to or less than 32MiB (equal to 33,554,432 bytes) will work. This flash cart is recommended games requires RTC for full gameplay experience like day/nigh cycles, berry growth, and events. This cart uses Flash RAM for saves, so the save file will never be lost even when the battery dies. The battery is only for RTC, which should last 3-4 years. What's included: 1 x Flash Cart 1 x Cartridge Shell 1 x Plastic Case Will work with flashers like GB Operator, GBxCart, or Joey Jr.