Working Duration: 124 min O2 Capacity: 248 Ltr. Filled Weight of kit: 2.1 kg Duration specified is @2 liter per minute A complete oxygen medical kit that is 45 % lighter than traditional steel cylinders. Refillable and reusable. With its cylinder made from aluminum alloy, OxyGo is completely rust free unlike steel. The simple finger operated valve and regulator that can be used by the patient.