Package Included:1 x Oxygen Cylinder Features:1. Made of 6061 aviation aluminum material, durable2. Portable design, easy to operate.3. Can be carried on board. Specifications:Color: greenType: full heightModel: Respirator bag,Respirator bottleMaterial: aviation aluminum alloySize: 350x80x60mm/13.77*3.14*2.36''Net weight: 950gSpecification: 0.5 literPressure: 3000psi/200bar3Water volume: 26.62cuin/0.42 litersGas capacity: 3.0cuft/85 litersNumber of breaths on the surface: 30 times (calculated by 25 liters per breath)Respirator bag net weight: 153g Oxygen tank inflation method:1. High pressure gas cylinder inflation.2. Use the Scuba Adapter (available in dive shops) to introduce large bottles of gas into the vial.3. Electric air pump is inflated. Precautions:1. Suitable for leisure diving sources within 10 meters. Do not attempt to use it as a source of gas in deep water.2. The maximum storage pressure is 3000 PSI and cannot be used for gases with more than 40% oxygen.3. Please use clean, dry compressed air.4. When the pointer of the pressure gauge reaches the red area, stand up to the surface of the water and use it again after inflation.5. Don't forget to release the pressure before opening the lid.6. Shipment without gas delivery.7. Use an electric pump and a large oxygen cylinder to inflate it directly for about two minutes. It takes about 20 minutes to use a manual air pump.8. A gas-filled oxygen cylinder can be used underwater for about 10 minutes (a little difference depending on the respiratory rate of each person).9. Do not inflate more than 3000psi/200bar.