The Oxy-Serve II Oxygen Conserver is a dual lumen, pneumatic conserver. The lightweight conserver weighs 14 ounces. It has a breathing sensitivity of 0.32 (cm-H2O) and a 3:1 savings ratio. The Oxy-Serve II is capable of operating at all settings in the continuous flow mode. The dial design has separate continuous and conserve modes, which offers the simplicity of switching from a conserve to continuous mode with one easy-to-use dial.