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Cast Iron Electric Buzzer Bell School Office Factory. Multi-Voltage Compatibility: Supports AC 110V/220V and DC 12V/24V input for global use. OEM Customization: Custom design and voice options available for OEM orders. Durable Construction: Made of metal with double pure copper coil for reliability. Long Service Life: High quality ensures the bell lasts more than 5 years. Crisp Sound Quality: Uses electromagnet to strike steel for classical, crisp timbre. Wide Application: Ideal for schools, offices, hotels, factories, and apartments. Global Export Experience: Exported to over 20 countries with reliable quality. 2-Year Warranty: Comprehensive 2-year warranty coverage for peace of mind.