Liquid Oxygen Portables are designed to maximize patient comfort, convenience and ambulation in a compact package. Offered in an attractive leather-finish case, the Spirit models provide the average oxygen patient with longer duration, lightweight oxygen therapy on the move. With their comfortable, fashionable design, Spirits offer a new dimension of patient freedom. All models have a built-in electronic Digital Oxygen Conserving Device (DOCD), which delivers a set pulse volume of gas with each breath. The DOCD extends oxygen duration per setting, while allowing for the overall small size and light weight of the unit. The DOCD is powered by long-lasting dual C cell batteries, which are easy to change. Available in side and top fill options, the lightweight Spirits are easy to fill. The one step filling procedure is completed in less than one minute, with no power requirements.