No AC adapter 

• Plug in, easy to use replacement for original power supply (no modifications necessary).
• Utilizes your original DreamCast power button.
• Runs from an external 12V 3amp power supply ( included).
• Less heat inside your DreamCast means that will potentially last longer.
• More space inside your DreamCast for other mods.
• The DreamCast PSU is compatible with all regions and all versions of the DreamCast.