MK4-mini
From PHWiki
MK4-mini is a DS booting device from NeoFlash with NoPass functionality. It is physically the same size as an original DS game card, does not require an original DS game card and does not need to be programmed.
MK4-mini has a switch on top so you can boot into GBA mode without taking it out of the DS slot. It also has a built in 2M EEPROM save chip, and can store game saves depending on which patcher you use.
Unlike the MAX Media Launcher, the DS sleep function should work with the MK4-mini in the DS slot even in games that use the Nintendo SDK.
In addition to booting GBA cards using the PassMe entry point, the MK4-mini can also boot Magic Key 2 and Magic Key 3 cards through pak-swapping.[1]
