The EPSON Stylus Pro cartridges have "smart" chip. This device resets these chips to allow you to refill your cartridges.
This chip resetter is compatible with the following cartridges:
T6531, T6532, T6533, T6534, T6535, T6536, T6537, T6538, T6539, T653A, T653B
It is designed for the following printers:
EPSON Stylus Pro 4900