The pulse dose setting ranges from a single to six LPM. What's more, it features a ongoing location of 1 to 3 LPM for precision oxygen. The battery retains the two pulse dose mode chugging for approximately four hours and as much as one.five hours operating in the continual mode. https://allhealthmarket.com/product/medical-supplies/portable-oxygen-concentrator-generator/oxygen-concentrator-machine-camping-use-oxygenator-driving-oxygen-bar-with-24-hours-battery-lasting-oxygen/