nullï» Descritption: Compact portable lightweight, easy to carry. Breathe underwater diving with total freedom. Made of aviation aluminum material & meets manufacturing standards of diving equipment. The breathing nozzle is made from food grade silicone, which is safe & odorless. The pressure gauge has a luminous function, & the water is still clear at 80 meters. made from stainless steel, it is waterproof, corrosion resistant, high hardness, & durable. Specification: Name Diving Oxygen Cylinder Set Bottle Material Aviation Aluminum Color Black Bottle Size 40.2x 8.5cm/15.83"x 3.35" Bottle Capacity 1LMax Pressure 3000PSI/200BAR/20 M Pa Underwater Breathing Timeabout 15-20min Preventive Measure Warning:1. This product is suitable for recreational diving within 10 meters. Do not try to use it as air supply in deeper waters.2. This product can be used as a backup air source for recreational diving up to 30 meters deep. Before using this product, you must obtain the training & certification of the accredited institution for scuba diving technology. The use of this breathing apparatus by unauthorized personne at depths exceeding 10 meters may cause danger.3. This product is suitable for use in waters that above 10 degrees Celsius.4. Recommended maximum ascent speed is 15 metres per minute (the last 6 meters need to be 6 meters per minute).5. Do not carry products with signs of damage, leakage or undesirable performance.6. The maximum filling pressure of this product is 3000PSI, & it can not to use filled