The Power Replay is a Game Enhancer cheat code device created exclusively for the Playstation by Megacom. Since it plugs onto the port on the back of the console it only works on older versions of the console.
There may have been a Gameboy/Gameboy Color version as well.
- Megacom Power Replay III Game Enhancer - User Guide
Hardware
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Power Replay packaging
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Power Replay packaging
