R1900 continuous ink supply system 1.With chips, sensor 2.High quality 3.Install ... Epson printer R1900 Continuous Ink Supply System1. Chips, sensor, cartridge quality are good.2. Combo chip( ... 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 ...