Stationery concentrators don't offer pulse; they do continuous only. Pulse doses on ay machine, including Portable O2 Concentrators (POCs), means that you get a pulse or a bolus of O2 only when you breathe in.. Continuous means that the O2 comes continuously at a set level. Pulse is used most for "out and about" because it conserves O2. Whether you're using tanks, a LOX delivery system or POC, pulse does are common to conserve O2. There is no standard for what any setting means. A setting f 2 on one devce can be completely different from a setting of 2 another device. That's why you really need to do your research.

Part is used only when you breathe continuous is always on

Thank you Jean, that info is helpful. So many variables to consider but I will take my time and try to get it right.