The PrO2 Plus came from a desire to provide a portable oxygen system for any pilot to use, whether they’re a student pilot, renter, or aircraft owner wanting a back-up source of the good gas. The set-up features a simple on/off switch, a flow indicator, and an Aerox Oxysaver Conserving Cannula. The PrO2 Plus operates at a fixed flow rate good for use up to 18,000 ft msl. In a release, Ashton said, “We believe that pilots might be intimidated by the complexity and expense of some oxygen systems. We wanted to create a low-cost, easy to use system to encourage all pilots to have supplemental oxygen with them and to provide the quality, safety, and features of Aerox high-performance portable systems.” The PrO2 Plus retails for $399.