For sale is a Respironics Everflo Portable Oxygren Concentrator. This was purchased for my father in law who used it for about a year and it has not been used in the last 3 years. Everything still appears to be functioning fine with the machine and it will come with everything except the breathing hoses. This includes the concentrator, 2 batteries, carrying bag, accessory bag, rolling cart, wall charger and car charger.