Utilizes thirty minute cylinder containing pressurized air which is delivered to the facepiece. Regulator has only three moving parts, a "fail-open" design and protective housing. Kevlar® / Nomex® / PBI® harness and back plate assembly is designed for comfort and proper weight distribution during the most rigorous jobs. Comes equipped with a luminous pressure gauge, stainless steel whistle assembly and locking quick-connects. Include a carrying case.