- The silicone mask surface has well fit and seal with human face to avoid air leakage - There is one port design for CO2 measurement. - Very low noise and good compliance in use. - The connection between connector and mask body has cushion for better body position removing. - Quick release trap. - The nasal mask is designed with Headpad for better tightness. - The connector on CPAP mask is able to be turned around 360°.