Mini Scuba Tank: This portable scuba system includes 2 x 0.5L mini scuba tanks, offering 6-12 minutes of submersion time each. Ideal for a range of underwater depths, these tanks provide approximately 66 breaths for surface breathing. Innovative Lung Tank Design: The lung air tanks feature a luminous gauge for visibility up to 80 meters deep, a pressure relief valve for easy air venting, and a multi-filter air system for pure breathing, enhancing the scuba diving experience. Safety Features of Mini Scuba Tank: Equipped with a professional-grade dust cap for nozzle protection on each lung tank. The mini scuba tanks offer three inflation options for different diving scenarios, with a maximum inflation pressure of 3000PSI/200BAR/20MPA. Durable Construction of Lung Air Tank: Each lung air tank in this scuba kit is crafted from 6061 aluminum alloy with a multi-layer, corrosion-resistant coating, ensuring durability and reliability under water. Comprehensive Scuba Diving Kit & Instructions: The complete scuba package includes essential accessories for the mini scuba tanks: 1 manual pump, 1 refill adapter, 2 ropes, 2 diving goggles, 1 carry bag, 2 dive storage bags, and 2 flashlights. For safety, maintain the pressure of each lung tank below 20 MPa (200BAR/3000PSI). Before air travel, release the pressure and separate the breathing valve from each scuba tank. 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.