1. The 2L oxygen cylinder allows the diver to stay 1-10 meters underwater for 30-35 minutes (depending on individual lung capacity and depth of diving), perfect for beginners. 2. Supports 3 types of inflation: Manual high-pressure Inflatable pump, switch, electric inflator.(Inflator pump is not included) 3. Uses 6061T6 aluminum material and meets the manufacturing standards for diving equipment. 4. Compact portable ,easy to carry. 5. Made of aviation aluminum material and meets manufacturing standards of diving equipment. Name: Diving Oxygen Cylinder Maximum pressure: 3000PSI/200BAR/20MPa Max. dwell time underwater: 30-35mins Cylinder port: M18x1.5cm Application: Recreational diving, Training diving, spare Cylinder diving air Need to be used with Primary Pressure Reducing Valve and other accessories, can not be used alone. This product is suitable for 's x-4000 series/x-5000 series or other M18x1.5CM threaded valve port products. Colour:green Material:Aviation Aluminum Size: Length: 12.99 inch / 33 cm Diameter: 4.33 inch / 11 cm Capacity: 2L Package Contents: 1 x 2L Oxygen Cylinder (Primary Pressure Reducing Valve NOT included) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.