Cleansui MD301 Faucet-mounted water purifier Mitsubishi Chemical Cleansui MONO Series Purchased on Amazon in February 2022 and used for several months, then stored at home. The cartridge is included, but replacement is recommended. The LCD screen displays the remaining cartridge life and battery replacement indicator. A green light indicates the appropriate flow rate. When the remaining life is low, an orange light flashes to indicate it's time to replace the cartridge. Set Contents / Main unit Battery CR2032 (dead) Installation parts set Instruction manual Please check the images carefully before making your decision. Please refrain from purchasing if you are sensitive to used items.