Portable Scuba Oxygen Bottle: Can be submerged for about 5~10 minutes, can be used for adult surface breathing about 66 mouthfuls of air, different underwater depths, the available time also varies. Bottle mouth design: 1 - luminous instrument, deep pressure resistance visible at a glance, underwater depth of 80 meters is still clearly visible. 2 - pressure relief valve to release pressure, press to release the pressure of air venting. 3 - air filter to breathe pure air, multiple filter design to breathe pure air. Professional custom-made dust cap protects the air inlet nozzle to prevent bumping and affecting performance, 3 types of inflation according to the use of scenarios to choose, the maximum pressure of inflation: 3000PSI/200BAR/2OMPA. Multi-layer treatment for corrosion and high-pressure resistance: the aluminium alloy with multi-coat treatment has a fully automatic spraying mirror layer, mirror treatment with aluminium alloy,6061 aluminium alloy hot extrusion one-piece moulding. Use details: Oxygen cylinder pressure should not exceed 20 MPa (i.e. 200BAR or 3000PSI as shown on the pressure gauge) Before boarding the aircraft, please separate the breathing valve from the bottle, you need to press the top to release the pressure first and then the bottle will be separated. What if I want to go diving in the sea but don't have the professional equipment? With the Scuba Diving Cylinder, you can dive and feel the charm of the sea even if you are a novice! Name: Portable Scuba Oxygen Cylinder Specification: 0.5L Weight: 1.08KG Gas capacity: 100L (compressed air) Size: 35.3CM/long 2.25 "LB/5.71CM/diameter Number of breaths: approx. 66 breaths for the water surface Available time: 5-10 minutes