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Gas Shut-off Valve and Gas Leakage Alarm (MTGA04V). Advanced Semiconductor Sensor: Adopts advanced semiconductor sensor for fast response and high accuracy detection of combustible gases. Versatile Power Supply: Supports wide voltage input: 110V-265V AC or 12V/24V DC for flexible installation scenarios. Flexible Installation: Wall-mounted design allows use as independent family alarm or front detector for alarm systems. Certified Quality: Products are certified with CE, ISO, and RoHS standards ensuring safety and compliance. Customizable Options: Offers customized installation modes, operation voltages, and optional relay or valve outputs.