A transparent, air-entrainment, elongated mask with soft anatomical under the chin shape. A rotating sleeve air entrainment valve allows you to dial in seven different oxygen concentrations: 24, 26, 28, 31, 35, 40 or 50%. Aluminum nose clip aids in a positive fit for appropriate oxygen percentage delivery. Elastic head strap. Supplied with three channel, crush resistant safety tubing. A high humidity adapter is included.