Specifications:

1) Combo ARC Chip for Epson  T12/ T22/TX120/ TX129/TX320F/NX420/TX420W/ NX125/TX320F Printer

2) Offere with Switch and Reset Button

3) Can used without original Cartridge on with the Switch down

4) The white button has the reset ink level function 

5)Reset chip at one time

6)Use together with 2 #7 battery