Use original shell for Sega Genesis Megadrive game card.Use Flashkit MD Electroless Gold PCB Card, top quality, Super stable!.Reprogrammable cart. The game can be rewritten via our flashkit programmer device, Support more than 10000 rewrites. Support max rom size 4Mbyte (32M bit). Don't support to save game file..With independent power supply, more stable, not easy to damage. Each data line is impedance matched..Lead free environmental protection process.