The document discusses Sigma monoplace hyperbaric chambers manufactured by Millennium Aero Dynamics. The Sigma chambers have two independent control systems and safety features like pressure controlled door locks. They are designed for maximum patient comfort with extra wide gurneys and spacious interiors. The chambers are available in a range of sizes and configurations to accommodate different facilities. Perry Baromedical is a global leader in hyperbaric chamber manufacturing and services, having installed over 3500 chambers worldwide over 50 years.