This GE Healthcare CO2MIX20 28937795 Digital CO2 Controller is in unused condition and is guaranteed to be fully functional. This unit came from a local lab that had surplus inventory. We urge customers to view all photos as they show overall condition, included accessories and useful information. Listing only includes what is shown in photos. Sale of unit comes with a 30-day full money back guarantee return policy. We will be happy to provide additional information as well as photos so please feel free to contact us with any questions.