The second-generation products are adopting the latest research formula mixed metal oxide (MMO) anode material to produce auxiliary electrode. It takes advantage of the high corrosion resistance of IrO2 in acid medium, while also taking into account the higher oxygen evolution over potential of IrO2 electrode, and adding IrO2 and SnO2, RuO2, Ta2O5, PdO and so on to make composite metal oxide electrodes.