... ( when black switch is down,that is, chip select self-sensor, can be used without original cartridge, use for ... up ,that is, chip select original cartridge sensor,use with original cartridge,use CISS continuously) decrease the stock risk of ... continual ink supply system can use forPrinter model: T30/T33/T1100Cartridge model: T0731N, T0731N, T0732N, T0733N, T0734N new model continual ink supply system