The following information ONLY applies to DYMO label printers that use direct thermal printing technology. Currently, this includes all LabelWriter printers, LabelManager, LetraTag and Rhino series label makers. When stored properly, DYMO labels will have a shelf life of several years. When used in an office environment, printed labels will remain legible for over a year. The following conditions may cause labels to darken or the text to fade: exposure to direct sunlight or fluorescent light for an extended period of time, exposure to high temperatures for an extended period of time, contact with PVC film or vinyl containing plasticizers.