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En Approval Numens Wireless Input/Output Module. Professional Manufacturer: Numens is a professional fire alarm system manufacturer with vertically integrated capabilities. Global Certifications: Products certified by EN, BSI, UL, SGS and compliant with ISO 9001:2008 standards. Wide Application: Suitable for telephone, computer, workstation, server, mobile phone, and laptop usage. Fast Response: Sales representatives provide detailed price information within 1 workday after inquiry. DC 3V Power Source: The module operates on a DC 3V power source as specified in product attributes.