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Mechanical Strike Ding Dong Doorbell with Transformer. Durable Mechanism Design: Reliable operation for over 5 years with high-quality sound. OEM Customization Available: Accepts custom designs and voice recordings for branding. Wide Voltage Compatibility: Operates on AC 110V to 240V for global use. High Sound Output: Delivers a clear Ding Dong sound at 85dB. Premium Material Construction: Built with PC/ABS, Nylon, Steel, and Copper for durability. Global Export Experience: Exported to over 20 countries since 2005. Flexible Color Options: Available in White, Black, or customized OEM colors. 1-Year Warranty Coverage: Includes 1-year warranty for peace of mind.