ZYX120 Miners Isolated Compressed Oxygen Self Rescuer is mainly composed of the respiratory system and the CO2 filter system of high pressure system,consisting of high pressure system including oxygen bottles,oxygen bottle switch,pressure regulator,automatic and manual supply valve and pressure gauge. Model ZYX120 Protect time â?¥120min Capacity of oxygen bottle 1.0L Oxygen storage capacity 240L Inspiratory oxygen concentration 25% Inhaled carbon dioxide concentration 2% Quantitative supply of oxygen 1.2L/min Manual supply of oxygen supply 60L/min Cylinder filling pressure 20Mpa Period of validity 3-5 years Outline dimensions 285*205*100mm weight 4.3kg