Player function:
It equipped with 256Mbit Norflash, 2Mbit SRAM, Battery. so it can compatible with almost game for GBA(except which needs special hardware). and it has three advantages to compare with SDRAM/PSRAM solution.
1.The data still remain after power off.
2.Can be used as a standalone card for GBA.
3.Perfect linker for GBA/NDS.
Browser RAM expansion function:
It uses the highspeed ram cache as the offical one. perfect compatible with  Browser(JAP/EUR) for NDS
Rumble function:
Perfect works with all official rumble enabled games. it also has three level vibration strenth adjust. now you can adjust between power consume and better game feeling by yourself. SDK also provide for third party developers.