These devices are mainly manufactured for homecare use where it is very important to have an unlimited and cost effective source for Oxygen at long term Oxygen therapy. These devices do not require refilling but only the periodical maintenance which is very user friendly and easy What is the Difference Between Oxylive™ and OxylivePLUS™ ? Mainly there is no systematical difference between both models but at OXYLIVE PLUS™ model, there is the 2 Million hours lifetime Oxygen Sensor which functions for reading signals continuously. So the NUMERIC % VALUE can be seen permanently at the LCD screen which is the most important information for the user the pureness of the Oxygen that is delivered at that moment. On the LCD, the following information can be seen; the total operation hour(s), information and malfunctions of the device audio-visually.