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15 Round Dots Mechanical Strike Dingdong Doorbell. OEM Design and Voice: Supports customized design and voice options for personalized branding. Wide Voltage Compatibility: Operates on AC 110V-240V, suitable for global markets. High Sound Quality: Delivers clear Ding Dong sound at 85dB for reliable notification. Durable Construction: Made of PC/ABS, Nylon, Steel, and Copper for long-lasting use. Proven Reliability: Designed to function reliably for more than 5 years. Global Export Experience: Exported to over 20 countries with established international presence.