NOTE: This mask does not include a flowmeter. It is only compatible with the X3 On-Demand Conserver. To purchase the X3 On-Demand Conserver, search for "X3 On-Demand Solopack" SKU:2000003 This popular oxygen mask features a very comfortable blue silicone mask with a built-in Electret Microphone and a dual-lumen custom connection to the X3 Demand Conserver. The microphone allows you to communicate easily when flying high and the comfortable shape and soft silicone is smooth on your skin. NOTE: Oxygen equipment is non-returnable.