Feature:1. Adjustable Shoulder Straps: The backpack features adjustable shoulder straps and quick release buckles for easy fitting and removal of gear, saving you time.2. High Efficiency Filtration: 3 layer filtration can protect the inner core of the valve body, and at the same time can effectively prevent dust and impurities from being inhaled by the human body.3. Large Capacity: The oxygen cylinder is made of aviation aluminum, the surface is sprayed with plastic technology, high pressure air storage, and 3L large capacity, support 30 to 50 minutes diving time.4. Easy to Check The Remaining Air: To check the remaining air in the cylinder during a dive, we use an extended tube to connect the pressure gauge, which you can keep in sight.5. Rotary Valve Joint: The pressure reducing valve supports 360 degree rotary joint, which can rotate freely and adapt to any underwater posture. It is widely used in diving, underwater rescue, etc.Specification:Item Type: Scuba Tank KitMaterial: Aviation aluminum + copperBreathing Time: 30 to 50 minutes (depending on individual lung capacity)Valve Head Color: BlackMaximum Pressure: 20MPA, 3000PSI, 200BAR.Package List:1 xRebreather1 x Double Shoulder Clip1 x Diving Goggles8 x Sealing Ring1 x Gasket1 x Manual1 x Diving Tank