SPT-B4 type loudspeaker station is a new IP type industrial loudspeaker station launched by shollper Technology based on industry user needs and new industry engineering standards. The standard SIP2.0 session protocol can be matched and integrated with any SIP voice communication system. The shell is made of high-strength composite material through integrated die-casting, with good structural stability, and adopts unique waterproof and dustproof structural design, with extremely strong resistance to damage. The whole machine meets the national IP67 standard; Ultra wide voltage input range; Fanless design; Low power consumption; Strong anti-interference ability. It can be widely used in various scenarios such as subways, high-speed railways, highways, pipe galleries and tunnels, petrochemicals, power plants, mines, steel plants, docks, ships, etc.