This Power Brick and AC cord is a genuine original microsoft product just like the original one that came with your system when you bought it from the store,
Not A Cheap After Market Adapter That Might Ruin Your Console Only trust OEM (original equipment manufacturer) equipment

This is a new adapter never used before, 203w which means it works with every single Xbox out there even with the Falcon units,

XBOX 360 POWER SUPPLY BRICK 203W,