Reduce the noise of the air pump. Suitable for desert off-road sand prevention. When the surrounding air environment is bad, it can filter the airand protect the normal use of the machine. It is not affected by regions, traffic, and climate (such as highways,remote mountain villages, and on the way to and from get offwork), which can facilitate emergency response. Equipped with different inflatable nozzles, it can be used for cars,motorcycles, bicycles, kayaking and ball games.