【USING IT MORE SAFER】:SMACO S400 diving gear adopts a constant pressure air outlet device to make the air outlet pressure constant, making breathing very easy.At the same time, an external explosion-proof valve design is adopted, which makes the explosion-proof index more accurate and safer to use. 【LARGER CAPACITY BUT PORTABLE】: SMACO diving tank has a capacity of 1L, and can be used for 340 underwater breaths at full capacity. It can be used for 15-20 minutes of diving time.( Attention:Diving depth, temperature, and breathing rate will affect the use time of the scuba tank.) 【WIDE COMPATIBILITY】 :You can use a high pressure hand pump to inflate the scuba tank at any time.( Usually fill up in about 35-50 minutes.) Or,you can use 8mm SMACO refill adapters,large bottles guide vials,usually filling a 1 liter diving tank in 8 seconds.If you have a scuba tank air compressor at home (The pressure of air compressor must be higher than 3000PSI/200Bar/20MPA), it is convenient for you to inflate the diving tank. 【PRESSURE & CORROSION RESISTANT】: The entire body made of aerospace aluminium alloys better resists internal corrosion and stands up well to damage. Smaco cylinders are relatively small, yet very strong containers that hold large volumes of compressed gas. Make sure you get prepared on your next dive with one of our air tanks made from high-strength aluminium alloys. 【WHAT YOU WILL GET】: Perfect owner diving packages(include a 1L pony bottle and a clouth bag)