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The VoIP explosion-proof telephones are designed to provide safe, reliable communication for both indoor and outdoor hazardous areas, featuring a sturdy non-sparking, impact and shock resistant composite explosion-proof housing , it's ruggedly constructed to withstand the demanding conditions found within extreme environments, resulting in high reliability of the product long MTBF. They are IP-based telephone with automatic magnetic shut-off door to handle the large temperature differences, high humidity, exposure to sea water and dust, corrosive atmosphere, explosive gases/particles, as well as mechanical wear and tear, making it excellent for use as an emergency telephone.