1Respirator is made of aviation aluminum: aviation aluminum, standard portable oxygen tank parameters manufacturing, and meet the manufacturing standards of diving equipment. 2Pressure released from the top when pressing down the top. Note: the pressure shall not exceed 20 pressures. 3Regulator: open at any time, breathing balance on demand single regulator, with a pressure gauge, can show how much air. 4Ergonomic silicone bite fits mouth perfectly and comfortably. 5Portable and lightweight design: can carry it onto air plane for island diving etc.Features: Respirator is made of aviation aluminum: aviation aluminum, standard portable oxygen tank parameters manufacturing, and meet the manufacturing standards of diving equipment.Pressure released from the top when pressing down the top. Note: the pressure shall not exceed 20 pressures.Regulator: open at any time, breathing balance on demand single regulator, with a pressure gauge, can show how much air.Ergonomic silicone bite fits mouth perfectly and comfortably.Underwater diving freedom breath equipment.Give you more excelling experience on divingPortable and lightweight design: can carry it onto air plane for island diving etc. Specifications: Condition: 100% Brand New Model: S300 Color: As Pictures Shown Gas capacity: 3.0 CU FT/85 LITERS Maximum Pressure: 3000 psi/200 bar/20MPA Capacity: 0.5L Number of surface breaths: about 30 times (2.5 LITERS per breath) (it can breathe about 57 mouths of air on the surface, and adults can breathe about 21 times under the mouth of water, 7 meters under the water for about 6 minutes Size: approx.29*6*6cm/11.4*2.4*2.4in Weight: Approx.800gPackage list: 1 * oxygen cylinder