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Wired Strike Dingdong Door Bell. Durable Mechanism Design: Reliable construction ensures over 5 years of service life. High Volume Sound Output: Produces a clear Ding Dong sound at 85dB for effective alerting. Global Export Experience: Products exported to over 20 countries worldwide. Customizable Voltage: Supports 110-230V AC operation for international compatibility. OEM Design & Voice: Full OEM services available for custom designs and voice tones. Durable Material Build: Constructed with PC/ABS, Nylon, Steel, and Copper for longevity. Flexible Color Options: Available in White, Black, or customized OEM colors.