Flash2Advance Ultra

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F2A Ultra 512Mbit
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F2A Ultra 512Mbit

General information:
Available in sizes from 64Mbit to 2Gbit. Flashed via USB to the GBA link port or a separate USB linker. Official flashing software is PowerWriter. The early versions of the cards and software was plagued with various issues, the vast majority of which has since been ironed out. The very first batch had to be recalled for hardware errors. Native support for all three save types.
RTC
Real Time Save system (for quicksaves, called DIE-HARD)

Compatibility list
GBA(SP)
Nintendo DS
GBA Micro

Links